Top 500 Ruby Gems on RubyGems.org

1	rack (1.4.1) Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby....	17,231,306
2	activesupport (3.2.8) A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich ...	14,857,613
3	rake (0.9.2.2) Rake is a Make-like program implemented in Ruby. Tasks and dependencies arespecified in standard ...	14,775,442
4	activerecord (3.2.8) Databases on Rails. Build a persistent domain model by mapping database tables to Ruby classes. S...	12,759,779
5	actionpack (3.2.8) Web apps on Rails. Simple, battle-tested conventions for building and testing MVC web application...	12,551,914
6	actionmailer (3.2.8) Email on Rails. Compose, deliver, receive, and test emails using the familiar controller/view pat...	12,232,818
7	activeresource (3.2.8) REST on Rails. Wrap your RESTful web app with Ruby classes and work with them like Active Record ...	12,102,355
8	rails (3.2.8) Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable pr...	11,780,719
9	json (1.7.5) This is a JSON implementation as a Ruby extension in C.	11,727,594
10	mime-types (1.19) This library allows for the identification of a file's likely MIME content type. This is release ...	11,477,148
11	builder (3.1.3) Builder provides a number of builder objects that make creating structured data simple to do. Cu...	10,875,602
12	i18n (0.6.1) New wave Internationalization support for Ruby.	10,494,077
13	activemodel (3.2.8) A toolkit for building modeling frameworks like Active Record and Active Resource. Rich support f...	9,979,564
14	tzinfo (0.3.33) TZInfo is a Ruby library that uses the standard tz (Olson) database to provide daylight savings a...	9,778,312
15	erubis (2.7.0) Erubis is an implementation of eRuby and has the following features: * Very fast, almost thr...	9,456,904
16	rack-test (0.6.1) Rack::Test is a small, simple testing API for Rack apps. It can be used on its own or as a reusab...	9,234,479
17	mail (2.4.4) A really Ruby Mail handler.	9,219,889
18	polyglot (0.3.3) The Polyglot library allows a Ruby module to register a loader for the file type associated with...	9,153,759
19	arel (3.0.2) Arel is a SQL AST manager for Ruby. It 1. Simplifies the generation of complex SQL queries 2. Ad...	9,145,349
20	treetop (1.4.10) A Ruby-based text parsing and interpretation DSL	9,088,013
21	thor (0.16.0) A scripting framework that replaces rake, sake and rubigen	8,845,773
22	railties (3.2.8) Rails internals: application bootup, plugins, generators, and rake tasks.	8,841,302
23	multi_json (1.3.6) A gem to provide easy switching between different JSON backends, including Oj, Yajl, the JSON gem...	8,091,272
24	bundler (1.2.1) Bundler manages an application's dependencies through its entire life, across many machines, syst...	7,599,212
25	tilt (1.3.3) Generic interface to multiple Ruby template engines	7,304,051
26	rdoc (3.12) RDoc produces HTML and command-line documentation for Ruby projects. RDoc includes the +rdoc+ an...	6,367,997
27	nokogiri (1.5.5) Nokogiri (鋸) is an HTML, XML, SAX, and Reader parser. Among Nokogiri's many features is the ab...	6,258,721
28	rack-mount (0.8.3) A stackable dynamic tree based Rack router.	6,086,782
29	sprockets (2.6.0) Sprockets is a Rack-based asset packaging system that concatenates and serves JavaScript, CoffeeS...	5,071,664
30	rspec (2.11.0) BDD for Ruby	4,966,127
31	sass (3.2.1) Sass makes CSS fun again. Sass is an extension of CSS3, adding nested rules, variable...	4,872,988
32	net-ssh (2.6.0) Net::SSH: a pure-Ruby implementation of the SSH2 client protocol. It allows you to write programs...	4,829,406
33	rack-cache (1.2) Rack::Cache is suitable as a quick drop-in component to enable HTTP caching for Rack-based applic...	4,719,831
34	jquery-rails (2.1.3) This gem provides jQuery and the jQuery-ujs driver for your Rails 3 application.	4,523,495
35	diff-lcs (1.1.3) Diff::LCS is a port of Perl's Algorithm::Diff that uses the McIlroy-Hunt longest common subsequen...	4,404,346
36	sinatra (1.3.3) Sinatra is a DSL for quickly creating web applications in Ruby with minimal effort.	4,330,793
37	hike (1.2.1) A Ruby library for finding files in a set of paths.	4,303,737
38	addressable (2.3.2) Addressable is a replacement for the URI implementation that is part of Ruby's standard library. ...	4,237,190
39	rspec-core (2.11.1) BDD for Ruby. RSpec runner and example groups.	4,172,111
40	highline (1.6.15) A high-level IO library that provides validation, type conversion, and more for command-line inte...	4,137,550
41	rack-ssl (1.3.2) Rack middleware to force SSL/TLS.	4,124,776
42	rspec-expectations (2.11.3) rspec expectations (should[_not] and matchers)	4,110,391
43	rspec-mocks (2.11.3) RSpec's 'test double' framework, with support for stubbing and mocking	4,098,675
44	abstract (1.0.0) 'abstract.rb' is a library which enable you to define abstract method in Ruby.	4,011,383
45	haml (3.1.7) Haml (HTML Abstraction Markup Language) is a layer on top of XHTML or XML that's desi...	4,007,195
46	execjs (1.4.0) ExecJS lets you run JavaScript code from Ruby.	3,874,290
47	daemons (1.1.9) Daemons provides an easy way to wrap existing ruby scripts (for example a self-written server) t...	3,831,000
48	sqlite3 (1.3.6) This module allows Ruby programs to interface with the SQLite3 database engine (http://www.sqlite...	3,768,728
49	rest-client (1.6.7) A simple HTTP and REST client for Ruby, inspired by the Sinatra microframework style of specifyin...	3,605,107
50	ffi (1.1.5) Ruby-FFI is a ruby extension for programmatically loading dynamic libraries, binding functions wi...	3,538,638
51	coffee-script-source (1.3.3) CoffeeScript is a little language that compiles into JavaScript. Underneath all of th...	3,509,211
52	rubyzip (0.9.9) rubyzip is a ruby module for reading and writing zip files	3,499,544
53	uglifier (1.3.0) Ruby wrapper for UglifyJS JavaScript compressor	3,465,187
54	bcrypt-ruby (3.0.1) bcrypt() is a sophisticated and secure hash algorithm designed by The OpenBSD project for...	3,435,781
55	systemu (2.5.2) description: systemu kicks the ass	3,415,879
56	json_pure (1.7.5) This is a JSON implementation in pure Ruby.	3,202,276
57	sass-rails (3.2.5) Sass adapter for the Rails asset pipeline.	3,190,159
58	coffee-script (2.2.0) Ruby CoffeeScript is a bridge to the JS CoffeeScript compiler.	3,088,249
59	rspec-rails (2.11.0) RSpec for Rails	3,087,291
60	eventmachine (1.0.0) EventMachine implements a fast, single-threaded engine for arbitrary network communications. It's...	3,023,841
61	rubygems-update (1.8.24) RubyGems is a package management framework for Ruby. This gem is an update for the RubyGems soft...	2,858,638
62	net-ssh-gateway (1.1.0) A simple library to assist in establishing tunneled Net::SSH connections	2,857,873
63	coffee-rails (3.2.2) Coffee Script adapter for the Rails asset pipeline.	2,838,885
64	selenium-webdriver (2.25.0) WebDriver is a tool for writing automated tests of websites. It aims to mimic the behaviour of a ...	2,800,596
65	mysql2 (0.3.11) A simple, fast Mysql library for Ruby, binding to libmysql	2,782,985
66	mysql (2.8.1) This is the MySQL API module for Ruby. It provides the same functions for Ruby programs that the ...	2,772,768
67	journey (1.0.4) Journey is a router. It routes requests.	2,741,786
68	will_paginate (3.0.3) will_paginate provides a simple API for performing paginated queries with Active Record, DataMapp...	2,697,592
69	net-scp (1.0.4) A pure Ruby implementation of the SCP client protocol	2,690,560
70	uuidtools (2.1.3) A simple universally unique ID generation library.	2,667,611
71	childprocess (0.3.5) This gem aims at being a simple and reliable solution for controlling external programs running i...	2,655,109
72	devise (2.1.2) Flexible authentication solution for Rails with Warden	2,615,325
73	warden (1.2.1) Rack middleware that provides authentication for rack applications	2,613,521
74	term-ansicolor (1.0.7) Ruby library that colors strings using ANSI escape sequences	2,454,716
75	pg (0.14.1) Pg is the Ruby interface to the {PostgreSQL RDBMS}[http://www.postgresql.org/]. It works with {P...	2,437,712
76	capistrano (2.13.4) Capistrano is a utility and framework for executing commands in parallel on multiple remote machi...	2,418,114
77	xml-simple (1.1.1) A simple API for XML processing.	2,361,690
78	factory_girl (4.1.0) factory_girl provides a framework and DSL for defining and using factories ...	2,338,429
79	gherkin (2.11.2) A fast Gherkin lexer/parser based on the Ragel State Machine Compiler.	2,279,697
80	net-sftp (2.0.5) A pure Ruby implementation of the SFTP client protocol	2,222,437
81	sqlite3-ruby (1.3.3) This module allows Ruby programs to interface with the SQLite3 database engine (http://www.sqlite...	2,142,551
82	cucumber (1.2.1) Behaviour Driven Development with elegance and joy	2,118,983
83	fastthread (1.0.7) Optimized replacement for thread.rb primitives	2,063,701
84	httparty (0.9.0) Makes http fun! Also, makes consuming restful web services dead easy.	2,042,246
85	launchy (2.1.2) Launchy is helper class for launching cross-platform applications in a fire and forget manner. Th...	2,002,701
86	orm_adapter (0.4.0) Provides a single point of entry for using basic features of ruby ORMs	1,981,564
87	capybara (1.1.2) Capybara is an integration testing tool for rack based web applications. It simulates how a user ...	1,962,024
88	faraday (0.8.4) HTTP/REST API client library.	1,920,469
89	columnize (0.3.6) In showing a long lists, sometimes one would prefer to see the value arranged aligned in columns...	1,911,532
90	fastercsv (1.5.5) FasterCSV is intended as a complete replacement to the CSV standard library. It is significantly ...	1,910,911
91	multipart-post (1.1.5) Use with Net::HTTP to do multipart form posts. IO values that have #content_type, #original_file...	1,878,860
92	thin (1.5.0) A thin and fast web server	1,867,576
93	yajl-ruby (1.1.0) Ruby C bindings to the excellent Yajl JSON stream-based parser library.	1,824,073
94	paperclip (3.2.0) Easy upload management for ActiveRecord	1,797,240
95	crack (0.3.1) Really simple JSON and XML parsing, ripped from Merb and Rails.	1,749,542
96	hoe (3.1.0) Hoe is a rake/rubygems helper for project Rakefiles. It helps you manage, maintain, and release y...	1,711,168
97	bson (1.7.0) A Ruby BSON implementation for MongoDB. For more information about Mongo, see http://www.mongodb....	1,703,739
98	mongo (1.7.0) A Ruby driver for MongoDB. For more information about Mongo, see http://www.mongodb.org.	1,685,636
99	redis (3.0.1) A Ruby client that tries to match Redis' API one-to-one, while still providing an idiomat...	1,678,500
100	oauth (0.4.7) OAuth Core Ruby implementation	1,668,686
101	hpricot (0.8.6) a swift, liberal HTML parser with a fantastic library	1,665,579
102	xpath (0.1.4) XPath is a Ruby DSL for generating XPath expressions	1,662,144
103	multi_xml (0.5.1) A gem to provide swappable XML backends utilizing LibXML, Nokogiri, Ox, or REXML.	1,650,047
104	database_cleaner (0.8.0) Strategies for cleaning databases. Can be used to ensure a clean state for testing.	1,643,314
105	newrelic_rpm (3.4.2.1) New Relic is a performance management system, developed by New Relic, Inc (http://www.newrelic.co...	1,594,522
106	bson_ext (1.7.0) C extensions to accelerate the Ruby BSON serialization. For more information about BSON, see http...	1,567,521
107	therubyracer (0.10.2) Call javascript code and manipulate javascript objects from ruby. Call ruby code and manipulate r...	1,497,641
108	passenger (3.0.17) Easy and robust Ruby web application deployment.	1,478,024
109	"ruby-hmac (0.4.0) This module provides common interface to HMAC functionality. HMAC is a kind of ""Message Authentic..."	1,465,845
110	factory_girl_rails (4.1.0) factory_girl_rails provides integration between factory_girl and rails 3 (currently just auto...	1,460,926
111	mocha (0.12.5) Mocking and stubbing library with JMock/SchMock syntax, which allows mocking and stubbing of meth...	1,443,899
112	libv8 (3.11.8.3) Distributes the V8 JavaScript engine in binary and source forms in order to support fast builds o...	1,422,207
113	bunny (0.8.0) A synchronous Ruby AMQP client that enables interaction with AMQP-compliant brokers.	1,402,528
114	rack-protection (1.2.0) You should use protection!	1,369,433
115	compass (0.12.2) Compass is a Sass-based Stylesheet Framework that streamlines the creation and maintainance of CSS.	1,359,590
116	hashie (1.2.0) Hashie is a small collection of tools that make hashes more powerful. Currently includes Mash (Mo...	1,348,575
117	chronic (0.8.0) Chronic is a natural language date/time parser written in pure Ruby.	1,337,311
118	rmagick (2.13.1) RMagick is an interface between Ruby and ImageMagick.	1,319,050
119	unicorn (4.3.1) \Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-laten...	1,316,437
120	aws-s3 (0.6.3) Client library for Amazon's Simple Storage Service's REST API	1,276,904
121	heroku (2.32.4) Client library and command-line tool to deploy and manage apps on Heroku.	1,267,498
122	excon (0.16.4) EXtended http(s) CONnections	1,265,933
123	oauth2 (0.8.0) A Ruby wrapper for the OAuth 2.0 protocol built with a similar style to the original OAuth gem.	1,257,445
124	chef (10.14.2) A systems integration framework, built to bring the benefits of configuration management to your ...	1,222,926
125	cucumber-rails (1.3.0) Cucumber Generator and Runtime for Rails	1,216,134
126	kgio (2.7.4) kgio provides non-blocking I/O methods for Ruby without raising exceptions on EAGAIN and EINPROGR...	1,215,453
127	RedCloth (4.2.9) Textile parser for Ruby.	1,199,004
128	rubyforge (2.0.4) A script which automates a limited set of rubyforge operations. * Run 'rubyforge help' for compl...	1,188,650
129	cascading.jruby (0.0.9) cascading.jruby is a small DSL above Cascading, written in JRuby	1,159,093
130	ansi (1.4.3) The ANSI project is a superlative collection of ANSI escape code related libraries enabling ANSI ...	1,132,586
131	ohai (6.14.0) Ohai profiles your system and emits JSON	1,114,676
132	cancan (1.6.8) Simple authorization solution for Rails which is decoupled from user roles. All permissions are s...	1,112,382
133	redis-namespace (1.2.1) Adds a Redis::Namespace class which can be used to namespace calls to Redis. This is useful when ...	1,108,007
134	mixlib-log (1.4.1) A gem that provides a simple mixin for log functionality	1,069,339
135	mixlib-cli (1.2.2) A simple mixin for CLI interfaces, including option parsing	1,057,138
136	fog (1.6.0) The Ruby cloud services library. Supports all major cloud providers including AWS, Rackspace, Lin...	1,055,269
137	linecache (0.46) LineCache is a module for reading and caching lines. This may be useful for example in a debugger...	1,052,307
138	mixlib-config (1.1.2) A class based config mixin, similar to the one found in Chef.	1,048,426
139	ZenTest (4.8.2) ZenTest provides 4 different tools: zentest, unit_diff, autotest, and multiruby. zentest scans y...	1,042,070
140	mongrel (1.1.5) A small fast HTTP library and server that runs Rails, Camping, Nitro and Iowa apps.	1,041,906
141	chunky_png (1.2.6) This pure Ruby library can read and write PNG images without depending on an external im...	1,038,572
142	open4 (1.3.0) description: open4 kicks the ass	1,029,319
143	rvm (1.11.3.5) RVM ~ Ruby Environment Manager ~ Ruby Gem Library.	1,020,042
144	mixlib-authentication (1.3.0) Mixes in simple per-request authentication	1,015,493
145	gem_plugin (0.2.3) A plugin system based on rubygems that uses dependencies only	1,012,619
146	guard (1.3.3) Guard is a command line tool to easily handle events on file system modifications.	989,982
147	resque (1.22.0) Resque is a Redis-backed Ruby library for creating background jobs, placing those jobs on...	989,386
148	spork (0.9.2) A forking Drb spec server	989,152
149	archive-tar-minitar (0.5.2) Archive::Tar::Minitar is a pure-Ruby library and command-line utility that provides the ability t...	983,194
150	moneta (0.6.0) A unified interface to key/value stores	981,568
151	kaminari (0.14.1) Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated pag...	979,539
152	ruby-debug-base (0.10.4) ruby-debug is a fast implementation of the standard Ruby debugger debug.rb. It is implemented by ...	979,236
153	formtastic (2.2.1) A Rails form builder plugin/gem with semantically rich and accessible markup	975,458
154	vegas (0.1.11) Vegas aims to solve the simple problem of creating executable versions of Sinatra/Rack apps. It i...	974,176
155	coderay (1.0.7) Fast and easy syntax highlighting for selected languages, written in Ruby. Comes with RedCloth in...	964,091
156	cocaine (0.3.1) A small library for doing (command) lines	958,259
157	sexp_processor (4.0.1) sexp_processor branches from ParseTree bringing all the generic sexp processing tools with it. Se...	956,301
158	fssm (0.2.9) The File System State Monitor keeps track of the state of any number of paths and will fire event...	955,725
159	faker (1.1.2) Faker, a port of Data::Faker from Perl, is used to easily generate fake data: names, addresses, p...	950,218
160	daemon_controller (1.0.0) A library for robust daemon management.	932,100
161	ruby-debug (0.10.4) A generic command line interface for ruby-debug.	920,749
162	rcov (1.0.0) rcov is a code coverage tool for Ruby.	918,568
163	formatador (0.2.3) STDOUT text formatting	911,734
164	memcache-client (1.8.5) A Ruby library for accessing memcached.	906,007
165	ruby-openid (2.2.0) A library for consuming and serving OpenID identities.	864,977
166	webrat (0.7.3) Webrat lets you quickly write expressive and robust acceptance tests for a Ruby web application. ...	864,798
167	libxml-ruby (2.3.3) The Libxml-Ruby project provides Ruby language bindings for the GNOME Libxml2 XML toolkit...	857,113
168	ruby_parser (2.3.1) ruby_parser (RP) is a ruby parser written in pure ruby (utilizing racc--which does by default use...	856,866
169	raindrops (0.10.0) Raindrops is a real-time stats toolkit to show statistics for Rack HTTP servers. It is designed ...	850,098
170	net-ssh-multi (1.1) Control multiple Net::SSH connections via a single interface.	846,776
171	capistrano-ext (1.2.1) Useful task libraries and methods for Capistrano	841,625
172	delayed_job (3.0.3) Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in t...	829,942
173	minitest (3.5.0) minitest provides a complete suite of testing facilities supporting TDD, BDD, mocking, and benchm...	823,114
174	macaddr (1.6.1) description: macaddr kicks the ass	823,093
175	configuration (1.3.2) description: configuration kicks the ass	816,741
176	right_http_connection (1.3.0) Rightscale::HttpConnection is a robust HTTP/S library. It implements a retry algorithm for low-l...	816,140
177	right_aws (3.0.4) == DESCRIPTION: The RightScale AWS gems have been designed to provide a robust, fast, and secure...	805,424
178	hoptoad_notifier (2.4.11) Send your application errors to our hosted service and reclaim your inbox.	804,683
179	uuid (2.3.5) UUID generator for producing universally unique identifiers based on RFC 4122 (http://www.ietf.or...	798,024
180	omniauth (1.1.1) A generalized Rack framework for multiple-provider authentication.	789,197
181	cgi_multipart_eof_fix (2.5.0) Fix an exploitable bug in CGI multipart parsing.	786,380
182	mongoid (3.0.6) Mongoid is an ODM (Object Document Mapper) Framework for MongoDB, written in Ruby.	784,609
183	authlogic (3.1.3) A clean, simple, and unobtrusive ruby authentication solution.	783,840
184	SystemTimer (1.2.3) Set a Timeout based on signals, which are more reliable than Timeout. Timeout is based on green t...	772,050
185	mechanize (2.5.1) The Mechanize library is used for automating interaction with websites. Mechanize automatically s...	769,149
186	Platform (0.4.0) Hopefully robust platform sensing	756,424
187	whenever (0.7.3) Clean ruby syntax for writing and deploying cron jobs.	752,313
188	libwebsocket (0.1.5) Universal Ruby library to handle WebSocket protocol	748,706
189	awesome_print (1.1.0) Great Ruby dubugging companion: pretty print Ruby objects to visualize their structure. Supports ...	744,501
190	sequel (3.39.0) The Database Toolkit for Ruby	743,321
191	shoulda (3.1.1) Making tests easy on the fingers and eyes	741,578
192	state_machine (1.1.2) Adds support for creating state machines for attributes on any Ruby class	731,654
193	turn (0.9.6) Turn provides a set of alternative runners for MiniTest, both colorful and informative.	724,258
194	httpclient (2.2.7) gives something like the functionality of libwww-perl (LWP) in Ruby	721,479
195	carrierwave (0.6.2) Upload files in your Ruby applications, map them to a range of ORMs, store them on different back...	713,550
196	ruby_core_source (0.1.5) Retrieve Ruby core source files	710,780
197	guard-rspec (1.2.1) Guard::RSpec automatically run your specs (much like autotest).	703,447
198	htmlentities (4.3.1) A module for encoding and decoding (X)HTML entities.	698,673
199	responders (0.9.2) A set of Rails 3 responders to dry up your application	685,376
200	extlib (0.9.15) Support library for DataMapper and Merb	682,347
201	pry (0.9.10) An IRB alternative and runtime developer console	675,089
202	linecache19 (0.5.12) Linecache is a module for reading and caching lines. This may be useful for example in a debugger...	660,410
203	curb (0.8.1) Curb (probably CUrl-RuBy or something) provides Ruby-language bindings for the libcurl(3), a full...	660,264
204	foreman (0.60.0) Process manager for applications with multiple components	658,450
205	yard (0.8.2.1) YARD is a documentation generation tool for the Ruby programming language. It enables the...	655,252
206	log4r (1.1.10) See also: http://logging.apache.org/log4j	654,281
207	net-ldap (0.3.1) Net::LDAP for Ruby (also called net-ldap) implements client access for the Lightweight Directory ...	651,039
208	simplecov (0.6.4) Code coverage for Ruby 1.9 with a powerful configuration library and automatic merging of coverag...	649,780
209	rdiscount (1.6.8) Fast Implementation of Gruber's Markdown in C	648,792
210	aws-sdk (1.6.6) AWS SDK for Ruby	646,949
211	rubygems-bundler (1.1.0) Stop using bundle exec. Integrate Rubygems and Bundler. Make rubygems generate bundler aware exec...	642,813
212	yui-compressor (0.9.6) A Ruby interface to YUI Compressor for minifying JavaScript and CSS assets.	642,205
213	culerity (0.2.15) Culerity integrates Cucumber and Celerity in order to test your application's full stack.	635,022
214	haml-rails (0.3.5) Haml-rails provides Haml generators for Rails 3. It also enables Haml as the templating engine fo...	634,685
215	inherited_resources (1.3.1) Inherited Resources speeds up development by making your controllers inherit all restful actions ...	623,264
216	twitter (3.7.0) A Ruby wrapper for the Twitter API.	621,831
217	data_objects (0.10.8) Provide a standard and simplified API for communicating with RDBMS from Ruby	621,164
218	rufus-scheduler (2.0.17) job scheduler for Ruby (at, cron, in and every jobs).	613,829
219	simplecov-html (0.5.3) Default HTML formatter for SimpleCov code coverage tool for ruby 1.9+	607,047
220	slop (3.3.3) A simple DSL for gathering options and parsing the command line	606,532
221	has_scope (0.5.1) Maps controller filters to your resource scopes	602,269
222	puppet (2.7.19) Puppet, an automated configuration management tool	599,888
223	test-unit (2.5.2) Ruby 1.9.x bundles minitest not Test::Unit. Test::Unit bundled in Ruby 1.8.x had not been improve...	590,106
224	method_source (0.8) retrieve the sourcecode for a method	587,496
225	dm-core (1.2.0) Faster, Better, Simpler.	579,045
226	metaclass (0.0.1) Adds a metaclass method to all Ruby objects	575,969
227	dalli (2.2.1) High performance memcached client for Ruby	572,740
228	simple_form (2.0.2) Forms made easy!	566,739
229	jruby-openssl (0.7.7) JRuby-OpenSSL is an add-on gem for JRuby that emulates the Ruby OpenSSL native library.	558,671
230	airbrake (3.1.4) Send your application errors to our hosted service and reclaim your inbox.	558,600
231	stringex (1.4.0) Some [hopefully] useful extensions to Ruby's String class. Stringex is made up of three libraries...	558,268
232	hirb (0.7.0) Hirb provides a mini view framework for console applications and uses it to improve ripl(irb)'s d...	556,657
233	ci_reporter (1.7.2) CI::Reporter is an add-on to Test::Unit, RSpec and Cucumber that allows you to generate XML repor...	553,945
234	activemerchant (1.28.0) Active Merchant is a simple payment abstraction library used in and sponsored by Shopify. It is w...	545,417
235	POpen4 (0.1.4) Open4 cross-platform	542,827
236	braintree (2.17.0) Ruby library for integrating with the Braintree Gateway	542,098
237	typhoeus (0.4.2) Like a modern code version of the mythical beast with 100 serpent heads, Typhoeus runs HTTP reque...	541,435
238	rack-openid (1.3.1) Provides a more HTTPish API around the ruby-openid library	537,637
239	money (5.0.0) This library aids one in handling money and different currencies.	536,593
240	trollop (2.0) Trollop is a commandline option parser for Ruby that just gets out of your way. One line of code ...	535,902
241	ruby-debug-base19 (0.11.25) ruby-debug is a fast implementation of the standard Ruby debugger debug.rb. It is implemented by ...	534,445
242	"timecop (0.5.2) A gem providing ""time travel"" and ""time freezing"" capabilities, making it dead simple to test tim..."	529,898
243	rb-fsevent (0.9.2) FSEvents API with Signals catching (without RubyCocoa)	529,314
244	simple_oauth (0.1.9) Simply builds and verifies OAuth headers	528,877
245	"acts_as_list (0.1.8) This ""acts_as"" extension provides the capabilities for sorting and reordering a number of objects..."	527,050
246	webmock (1.8.10) WebMock allows stubbing HTTP requests and setting expectations on HTTP requests.	525,603
247	dm-migrations (1.2.0) DataMapper plugin for writing and speccing migrations	523,885
248	celerity (0.9.2) Celerity is a JRuby wrapper around HtmlUnit – a headless Java browser with JavaScript support. ...	515,540
249	ipaddress (0.8.0) IPAddress is a Ruby library designed to make manipulation \ of IPv4 and IPv6 addresse...	510,237
250	acts-as-taggable-on (2.3.3) With ActsAsTaggableOn, you can tag a single model on several contexts, such as skills, interests,...	503,635
251	spreadsheet (0.7.3) The Spreadsheet Library is designed to read and write Spreadsheet Documents. As of version 0.6.0,...	497,821
252	rbx-require-relative (0.0.9) Ruby 1.9's require_relative for Rubinius and MRI 1.8. We also add abs_path which is like __FILE...	497,234
253	less (2.2.2) Invoke the Less CSS compiler from Ruby	497,029
254	jammit (0.6.5) Jammit is an industrial strength asset packaging library for Rails, providing both the CS...	493,886
255	"friendly_id (4.0.8) FriendlyId is the ""Swiss Army bulldozer"" of slugging and permalink plugins for Ruby on Rails. It ..."	490,080
256	net-http-persistent (2.7) Manages persistent connections using Net::HTTP plus a speed fix for Ruby 1.8. It's thread-safe to...	485,953
257	git (1.2.5) Ruby/Git is a Ruby library that can be used to create, read and manipulate Git repositories by wr...	483,551
258	ruby-prof (0.11.2) ruby-prof is a fast code profiler for Ruby. It is a C extension and therefore is many times faste...	483,331
259	meta_search (1.1.3) Allows simple search forms to be created against an AR3 model and its associations, ...	482,888
260	riddle (1.5.3) A Ruby API and configuration helper for the Sphinx search service.	482,005
261	ruby-ole (1.2.11.4) A library for easy read/write access to OLE compound documents for Ruby.	479,080
262	ruby-debug19 (0.11.6) A generic command line interface for ruby-debug.	478,969
263	mini_magick (3.4) Manipulate images with minimal use of memory via ImageMagick / GraphicsMagick	476,485
264	"bouncy-castle-java (1.5.0146.1) Gem redistribution of ""Legion of the Bouncy Castle Java cryptography APIs"" jars at http://www.bou..."	475,691
265	amqp (0.9.7) Widely used, feature-rich asynchronous AMQP 0.9.1 client with batteries included.	469,842
266	do_sqlite3 (0.10.8) Implements the DataObjects API for Sqlite3	466,227
267	dm-do-adapter (1.2.0) DataObjects Adapter for DataMapper	462,912
268	facter (1.6.12) You can prove anything with facts!	454,423
269	fakeweb (1.3.0) FakeWeb is a helper for faking web requests in Ruby. It works at a global level, without modifyin...	453,044
270	faraday_middleware (0.8.8) Various middleware for Faraday	451,891
271	escape (0.0.4) ...	448,694
272	prawn (0.12.0) Prawn is a fast, tiny, and nimble PDF generator for Ruby	443,713
273	subexec (0.2.2) Subexec spawns a subprocess with an optional timeout	442,603
274	oa-core (0.3.2) Core strategies for OmniAuth.	438,008
275	spruz (0.2.13) All the stuff that isn't good/big enough for a real library.	436,562
276	geokit (1.6.5) Geokit provides geocoding and distance calculation in an easy-to-use API	436,050
277	savon (1.2.0) Delicious SOAP for the Ruby community	433,391
278	syntax (1.0.0) Syntax is Ruby library for performing simple syntax highlighting.	433,062
279	em-http-request (1.0.3) EventMachine based, async HTTP Request client	428,263
280	thinking-sphinx (2.0.13) A concise and easy-to-use Ruby library that connects ActiveRecord to the Sphinx search daemon, ma...	420,763
281	shoulda-matchers (1.3.0) Making tests easy on the fingers and eyes	419,589
282	oa-oauth (0.3.2) OAuth strategies for OmniAuth.	418,817
283	fattr (2.2.1) description: fattr kicks the ass	418,568
284	lockfile (2.1.0) description: lockfile kicks the ass	415,147
285	http_parser.rb (0.5.3) Ruby bindings to http://github.com/ry/http-parser and http://github.com/a2800276/http-parser.java	415,034
286	autotest (4.4.6) This is a stub gem to fix the confusion caused by autotest being part of the ZenTest suite.	414,357
287	wirble (0.1.3) Handful of common Irb features, made easy.	405,505
288	rsolr (1.0.8) RSolr aims to provide a simple and extensible library for working with Solr	399,606
289	fxruby (1.6.25) FXRuby is the Ruby binding to the FOX GUI toolkit.	398,271
290	httpi (1.1.1) HTTPI provides a common interface for Ruby HTTP libraries.	395,789
291	gemcutter (0.7.1) Provides the `gem yank` and `gem webhook` commands to RubyGems.	395,372
292	parallel (0.5.18) Run any kind of code in parallel processes	393,534
293	ruby-openid-apps-discovery (1.2.0) Extension to ruby-openid that enables discovery for Google Apps domains	389,290
294	jasmine (1.2.1) Test your JavaScript without any framework dependencies, in any environment, and with a nice desc...	386,946
295	bootstrap-sass (2.1.0.0) Twitter's Bootstrap, converted to Sass and ready to drop into Rails or Compass	382,223
296	email_spec (1.2.1) Easily test email in rspec and cucumber	379,569
297	em-resolv-replace (1.1.3) EventMachine-aware DNS lookup for Ruby	374,284
298	dm-sqlite-adapter (1.2.0) Sqlite3 Adapter for DataMapper	374,217
299	closure-compiler (1.1.7) A Ruby Wrapper for the Google Closure Compiler.	373,008
300	rr (1.0.4) RR (Double Ruby) is a double framework that features a rich selection of double techniques and a ...	372,164
301	Ascii85 (1.0.2) Ascii85 provides methods to encode/decode Adobe's binary-to-text encoding of the same name.	372,120
302	sanitize (2.0.3) Whitelist-based HTML sanitizer.	370,253
303	ruby2ruby (1.3.1) ruby2ruby provides a means of generating pure ruby code easily from RubyParser compatible Sexps. ...	369,820
304	pdf-reader (1.2.0) The PDF::Reader library implements a PDF parser conforming as much as possible to the PDF specifi...	364,354
305	polyamorous (0.5.0) This is just an extraction from Ransack/Squeel. You probably don't want to use this dire...	360,552
306	babosa (0.3.8) A library for creating slugs. Babosa an extraction and improvement of the string code fro...	356,569
307	omniauth-oauth2 (1.1.1) An abstract OAuth2 strategy for OmniAuth.	355,903
308	"colored (1.2) >> puts ""this is red"".red >> puts ""this is red with a blue background (read: ugly)"".red_on_..."	355,144
309	ruby-progressbar (1.0.1) Ruby/ProgressBar is an extremely flexible text progress bar library for Ruby. The output can be c...	353,348
310	liquid (2.4.1) A secure, non-evaling end user template engine with aesthetic markup.	353,153
311	hmx_client (0.1.0) Gives a client the ability to interact fully with the API for HMX	353,044
312	guard-spork (1.2.0) Guard::Spork automatically manage Spork DRb servers.	348,933
313	jeweler (1.8.4) Simple and opinionated helper for creating Rubygem projects on GitHub	345,101
314	redcarpet (2.1.1) A fast, safe and extensible Markdown to (X)HTML parser	343,469
315	rubyntlm (0.1.1) Ruby/NTLM provides message creator and parser for the NTLM authentication.	340,516
316	gyoku (0.4.6) Gyoku converts Ruby Hashes to XML	336,681
317	rb-inotify (0.8.8) A Ruby wrapper for Linux's inotify, using FFI	335,733
318	pyu-ruby-sasl (0.0.3.3) Simple Authentication and Security Layer (RFC 4422)	333,543
319	oa-openid (0.3.2) OpenID strategies for OmniAuth.	333,151
320	amazon-ec2 (0.9.17) A Ruby library for accessing the Amazon Web Services EC2, ELB, RDS, Cloudwatch, and Autoscaling A...	332,656
321	aasm (3.0.9) AASM is a continuation of the acts as state machine rails plugin, built for plain Ruby objects.	331,458
322	net-http-digest_auth (1.2.1) An implementation of RFC 2617 - Digest Access Authentication. At this time the gem does not drop...	328,311
323	aws (2.5.7) AWS Ruby Library for interfacing with Amazon Web Services including EC2, S3, SQS, SimpleDB and mo...	320,253
324	haml-edge (3.1.79) Haml (HTML Abstraction Markup Language) is a layer on top of XHTML or XML that's desi...	318,618
325	activerecord-jdbc-adapter (1.2.2) activerecord-jdbc-adapter is a database adapter for Rails\' ActiveRecord component that can be us...	316,781
326	webrobots (0.0.13) This library helps write robots.txt compliant web robots in Ruby.	314,764
327	commonjs (0.2.6) Host CommonJS JavaScript environments in Ruby	314,435
328	annotate (2.5.0) Annotates Rails/ActiveRecord Models, routes, fixtures, and others based on the database schema.	313,507
329	rspec-instafail (0.2.4) Show failing specs instantly	313,032
330	oa-enterprise (0.3.2) Enterprise strategies for OmniAuth.	312,446
331	oa-basic (0.3.2) HTTP Basic strategies for OmniAuth.	311,379
332	jwt (0.1.5) JSON Web Token implementation in Ruby	311,131
333	less-rails (2.2.3) The dynamic stylesheet language for the Rails asset pipeline. Allows other gems to extend Less lo...	310,930
334	dynamic_form (1.1.4) DynamicForm holds a few helper methods to help you deal with your Rails3 models. It includes the ...	307,014
335	six-updater-web (0.24.15) Your summary here	306,106
336	win32-api (1.4.8) The Win32::API library is meant as a replacement for the Win32API library that ships as p...	306,033
337	em-websocket (0.3.8) EventMachine based WebSocket server	303,454
338	file-tail (1.0.11) Library to tail files in Ruby	301,217
339	listen (0.5.2) The Listen gem listens to file modifications and notifies you about the changes. Works everywhere!	299,653
340	netrc (0.7.7) This library can read and update netrc files, preserving formatting including comments and whites...	299,642
341	god (0.13.1) An easy to configure, easy to extend monitoring framework written in Ruby.	299,263
342	taps (0.3.24) A simple database agnostic import/export app to transfer data to/from a remote database.	296,250
343	geoip (1.1.2) GeoIP searches a GeoIP database for a given host or IP address, and returns information about the...	295,766
344	flog (2.5.3) Flog reports the most tortured code in an easy to read pain report. The higher the score, the mor...	293,561
345	omniauth-facebook (1.4.1) Facebook strategy for OmniAuth	291,142
346	rmail (1.0.0) RMail is a lightweight mail library containing various utility classes and modules that allow rub...	290,491
347	mongo_mapper (0.12.0) A Ruby Object Mapper for Mongo	288,211
348	paper_trail (2.6.3) Track changes to your models' data. Good for auditing or versioning.	285,949
349	sunspot (1.3.3) Sunspot is a library providing a powerful, all-ruby API for the Solr search engine. Sunspot m...	281,413
350	blankslate (3.1.2) BlankSlate provides a base class where almost all of the methods from Object and Kernel have been...	279,911
351	dragonfly (0.9.12) Dragonfly is a framework that enables on-the-fly processing for any content type. It is especia...	279,223
352	exception_notification (2.6.1) Exception notification by email for Rails apps	278,960
353	zip (2.0.2) zip is a Ruby library for reading and writing Zip files. Unlike the official rubyzip, zip is comp...	277,785
354	RubyInline (3.11.3) Inline allows you to write foreign code within your ruby code. It automatically determines if the...	277,514
355	backports (2.6.4) Essential backports that enable some of the really nice features of ruby 1.8.7, ruby 1.9 an...	277,141
356	msgpack (0.4.7) MessagePack, a binary-based efficient data interchange format.	276,258
357	dm-validations (1.2.0) Library for performing validations on DM models and pure Ruby object	275,015
358	nori (1.1.3) XML to Hash translator	274,402
359	librex (0.0.68) Rex provides a variety of classes useful for security testing and exploit development. Based on S...	274,263
360	rails_best_practices (1.11.1) a code metric tool for rails codes, written in Ruby.	273,896
361	nifty-generators (0.4.6) A collection of useful Rails generator scripts for scaffolding, layout files, authentication, and...	273,048
362	machinist (2.0) Fixtures aren't fun. Machinist is.	272,828
363	koala (1.5.0) Koala is a lightweight, flexible Ruby SDK for Facebook. It allows read/write access to the socia...	272,283
364	dm-timestamps (1.2.0) DataMapper plugin for magical timestamps	271,544
365	jasmine-core (1.2.0) Test your JavaScript without any framework dependencies, in any environment, and with a nice desc...	268,093
366	resque-scheduler (2.0.0) Light weight job scheduling on top of Resque. Adds methods enqueue_at/enqueue_in to schedule ...	266,782
367	memcached (1.4.5) An interface to the libmemcached C client.	266,763
368	httpauth (0.2.0) Library for the HTTP Authentication protocol (RFC 2617)	266,623
369	mixlib-shellout (1.1.0) Run external commands on Unix or Windows	265,118
370	dm-aggregates (1.2.0) DataMapper plugin providing support for aggregates on collections	264,924
371	parseconfig (1.0.2) ParseConfig provides simple parsing of standard configuration files in the form of 'param = value...	264,321
372	fuubar (1.0.0) the instafailing RSpec progress bar formatter	261,165
373	maruku (0.6.1) Maruku is a Markdown interpreter in Ruby. It features native export to HTML and PDF (via Latex)....	260,729
374	windows-pr (1.2.2) The windows-pr library is a collection of Windows functions and constants pre-defined for...	260,525
375	mustache (0.99.4) Inspired by ctemplate, Mustache is a framework-agnostic way to render logic-free views. As ctemp...	260,118
376	rpm_contrib (2.1.11) Community contributed instrumentation for various frameworks based on the New Relic Ruby monitori...	257,624
377	sunspot_rails (1.3.3) Sunspot::Rails is an extension to the Sunspot library for Solr search. Sunspot::Rails add...	257,526
378	aaronh-chronic (0.3.9) A natural language date parser with timezone support	254,815
379	http_connection (1.4.1) HTTP helper library	254,522
380	sup (0.12.1) Sup is a console-based email client for people with a lot of email. It supports tagging, very fas...	254,055
381	escape_utils (0.2.4) Faster string escaping routines for your web apps	253,905
382	stomp (1.2.5) Ruby client for the Stomp messaging protocol. Note that this gem is no longer supported on rubyf...	253,841
383	flay (1.4.3) Flay analyzes code for structural similarities. Differences in literal values, variable, class, m...	253,049
384	logging (1.8.0) Logging is a flexible logging library for use in Ruby programs based on the design of Java's log4...	252,142
385	dm-types (1.2.2) DataMapper plugin providing extra data types	249,217
386	plucky (0.5.2) Thin layer over the ruby driver that allows you to quickly grab hold of your data (pluck it!).	247,834
387	ttfunk (1.0.3) Get Ya TrueType Funk On! (Font Metrics Parser for Prawn)	245,528
388	selenium-client (1.2.18) Official Ruby Client for Selenium RC.	242,809
389	wasabi (2.5.1) A simple WSDL parser	242,654
390	rails3-generators (0.17.6) Rails 3 compatible generators for gems that don't have them yet	242,365
391	searchlogic (2.5.8) Searchlogic makes using ActiveRecord named scopes easier and less repetitive.	240,188
392	ruby-debug-ide (0.4.16) An interface which glues ruby-debug to IDEs like Eclipse (RDT), NetBeans and RubyMine.	238,670
393	alpha_omega (1.0.1) Common reciples for persistent capistrano releases	237,917
394	growl (1.0.3) growlnotify bindings	237,281
395	vcr (2.2.5) VCR provides a simple API to record and replay your test suite's HTTP interactions. It works wit...	236,432
396	oa-more (0.3.2) Additional strategies for OmniAuth.	236,159
397	thrift (0.8.0) Ruby bindings for the Apache Thrift RPC system	235,827
398	capybara-webkit (0.12.1) Headless Webkit driver for Capybara	235,496
399	akami (1.2.0) Building Web Service Security	235,314
400	pr_geohash (1.0.0) GeoHash encode/decode library for pure Ruby. It's implementation of http://en.wikipedia.org/wiki...	233,452
401	rb-fchange (0.0.6) A Ruby wrapper for Windows Kernel functions for monitoring the specified directory or subtree	232,118
402	bourbon (2.1.1) The purpose of Bourbon Vanilla Sass Mixins is to provide a comprehensive framework of sass mixins...	232,014
403	compass-rails (1.0.3) Integrate Compass into Rails 2.3 and up.	230,842
404	pony (1.4) Send email in one command: Pony.mail(:to => 'someone@example.com', :body => 'hello')	229,868
405	plist (3.1.0) Plist is a library to manipulate Property List files, also known as plists. It can parse plist f...	227,801
406	kramdown (0.14.0) kramdown is yet-another-markdown-parser but fast, pure Ruby, using a strict syntax definition and...	227,483
407	awesome_nested_set (2.1.4) An awesome nested set implementation for Active Record	227,376
408	main (5.1.0) description: main kicks the ass	227,171
409	hiredis (0.4.5) Ruby extension that wraps Hiredis (blocking connection and reply parsing)	227,017
410	icalendar (1.2.0) This is a Ruby library for dealing with iCalendar files. Rather than explaining myself, here is ...	226,764
411	autotest-rails (4.1.2) This is an autotest plugin to provide rails support. It provides basic rails support and extra pl...	226,618
412	six-updater (0.22.5) Your summary here	225,039
413	posix-spawn (0.3.6) posix-spawn uses posix_spawnp(2) for faster process spawning	224,889
414	bluecloth (2.2.0) BlueCloth is a Ruby implementation of John Gruber's Markdown[http://daringfireball.net/projects/m...	223,719
415	rake-compiler (0.8.1) Provide a standard and simplified way to build and package Ruby extensions (C, Java) using Rake a...	223,520
416	activeadmin (0.5.0) The administration framework for Ruby on Rails.	222,340
417	truncate_html (0.5.5) Truncates html so you don't have to	221,097
418	jruby-jars (1.6.8) This gem includes the core JRuby code and the JRuby 1.8 stdlib as jar files. It provides a way to...	220,088
419	little-plugger (1.1.3) LittlePlugger is a module that provides Gem based plugin management. By extending your own class ...	219,900
420	fb_graph (2.5.0) A full-stack Facebook Graph API wrapper in Ruby.	219,595
421	em-socksify (0.2.1) EventMachine SOCKSify shim: adds SOCKS support to any protocol	219,464
422	twitter-bootstrap-rails (2.1.3) twitter-bootstrap-rails project integrates Bootstrap CSS toolkit for Rails 3.1 Asset Pipeline	217,976
423	progressbar (0.11.0) Ruby/ProgressBar is a text progress bar library for Ruby. It can indicate progress with percentag...	217,582
424	system_timer (1.2.4) Set a Timeout based on signals, which are more reliable than Timeout. Timeout is based on green t...	216,905
425	configatron (2.9.1) configatron was developed by: markbates	216,183
426	spider (0.4.4) A Web spidering library: handles robots.txt, scraping, finding more links, and doing it all over ...	215,392
427	dm-serializer (1.2.2) DataMapper plugin for serializing Resources and Collections	215,342
428	pdfkit (0.5.2) Uses wkhtmltopdf to create PDFs using HTML	215,231
429	rchardet (1.3) Character encoding auto-detection in Ruby. As smart as your browser. Open source.	214,926
430	rabl (0.7.2) General ruby templating with json, bson, xml and msgpack support	212,598
431	geocoder (1.1.3) Provides object geocoding (by street or IP address), reverse geocoding (coordinates to street add...	212,078
432	ruby-graphviz (1.0.8) Ruby/Graphviz provides an interface to layout and generate images of directed graphs in a variety...	210,139
433	bundle (0.0.1) You really mean `gem install bundler`. It's okay. I'll fix it for you this one last time...	209,411
434	heroku-api (0.3.5) Ruby Client for the Heroku API	206,911
435	bitly (0.8.0) Use the bit.ly API to shorten or expand URLs	206,812
436	jruby-launcher (1.0.15-java) Builds and installs a native launcher for JRuby on your system	205,697
437	http_router (0.11.0) This library allows you to recognize and build URLs in a Rack application.	205,261
438	after_commit (1.0.10) A Ruby on Rails plugin to add an after_commit callback. This can be used to trigger methods ...	204,037
439	foreigner (1.2.1) Adds helpers to migrations and dumps foreign keys to schema.rb	203,885
440	soap4r (1.5.8) An implementation of SOAP 1.1 for Ruby.	202,746
441	ffaker (1.15.0) Faster Faker, generates dummy data.	201,760
442	pickle (0.4.11) Easy model creation and reference in your cucumber features	201,609
443	refinerycms (2.0.8) A Ruby on Rails CMS that supports Rails 3.2. It's easy to extend and sticks to 'the Rails way' wh...	201,163
444	prawn-layout (0.8.4) An extension to Prawn that provides table support and other layout functionality	201,076
445	milia (0.3.30) Transparent Multi-tenanting for hosted Rails 3.1+/Ruby 1.9.2 applications	200,984
446	arrayfields (4.7.4) arrayfields	200,429
447	dm-constraints (1.2.0) DataMapper plugin constraining relationships	200,287
448	scout (5.5.9) Scout makes monitoring and reporting on your web applications as flexible and simple as possible.	199,855
449	bluepill (0.0.60) Bluepill keeps your daemons up while taking up as little resources as possible. After all you pro...	199,476
450	facets (2.9.3) Facets is the premier collection of extension methods for the Ruby programming language. Facets e...	199,170
451	slim (1.3.1) Slim is a template language whose goal is reduce the syntax to the essential parts without becomi...	198,996
452	prawn-core (0.8.4) Prawn is a fast, tiny, and nimble PDF generator for Ruby	198,910
453	windows-api (0.4.2) The windows-api library provides features over and above the basic interface provided by ...	197,139
454	omniauth-oauth (1.0.1) A generic OAuth (1.0/1.0a) strategy for OmniAuth.	196,831
455	active_utils (1.0.5) Common utils used by active_merchant, active_fulfillment, and active_shipping	196,230
456	attribute-kit (0.2.0) Tools for attribute tracking like Hashes with dirty tracking and events, for building hybrid mode...	196,227
457	mini_exiftool (1.6.0) This library is wrapper for the Exiftool command-line application (http://www.sno.phy.queensu.ca/...	195,353
458	jruby-rack (1.1.10) JRuby-Rack is a combined Java and Ruby library that adapts the Java Servlet API to Rack. For JRub...	194,083
459	routing-filter (0.3.1) Routing filters wraps around the complex beast that the Rails routing system is, allowing for uns...	192,648
460	flexmock (1.0.3) FlexMock is a extremely simple mock object class compatible with the Test::Unit fram...	190,520
461	color (1.4.1) The capabilities of the Color library are limited to pure mathematical manipulation of the colour...	188,576
462	vj-sdk (0.7.14) Videojuicer core-sdk	188,267
463	grit (2.5.0) Grit is a Ruby library for extracting information from a git repository in an object oriented man...	186,424
464	parallel_tests (0.8.12) Run Test::Unit / RSpec / Cucumber in parallel	186,086
465	temple (0.5.3) Template compilation framework in Ruby	186,082
466	win32-process (0.7.0) The win32-process library implements several Process methods that are either unimplemente...	183,996
467	omniauth-twitter (0.0.13) OmniAuth strategy for Twitter	183,463
468	reek (1.2.12) Reek is a tool that examines Ruby classes, modules and methods and reports any code smells it fin...	182,305
469	recaptcha (0.3.4) This plugin adds helpers for the reCAPTCHA API	182,225
470	exceptional (2.0.32) Exceptional is the Ruby gem for communicating with http://getexceptional.com (hosted error tracki...	181,051
471	watchr (0.7) Modern continious testing (flexible alternative to autotest).	180,702
472	activerecord-jdbcmysql-adapter (1.2.2) Install this gem to use MySQL with JRuby on Rails.	178,736
473	settingslogic (2.0.8) A simple and straightforward settings solution that uses an ERB enabled YAML file and a singleton...	178,089
474	dm-transactions (1.2.0) Makes transaction support available for adapters that support them	177,184
475	autotest-growl (0.2.16) This gem aims to improve support for Growl notifications by autotest.	177,135
476	activerecord-sqlserver-adapter (3.2.9) SQL Server 2005 and 2008 Adapter For ActiveRecord	174,804
477	viewcumber (0.3.1) Cucumber formatter for easily viewing each step of your scenarios	174,577
478	ghostplus (0.0.1) Allows you to create, list, and modify local hostnames	173,061
479	tmail (1.2.7.1) TMail is a Ruby-based mail handler. It allows you to compose stadards compliant emails in a very ...	172,411
480	roodi (2.1.0) Roodi stands for Ruby Object Oriented Design Inferometer. It parses your Ruby code and warns you...	172,380
481	SyslogLogger (1.4.1) SyslogLogger is a Logger replacement that logs to syslog. It is almost drop-in with a few differ...	171,886
482	jenkins (0.6.8) A suite of utilities for bringing continous integration to your projects (not the other way aroun...	171,570
483	prawn-security (0.8.4) Prawn/Security adds document encryption, password protection, and permissions to Prawn.	170,816
484	scale_down (0.7.3) A Sinatra based server for quickly scaling and serving images. Nothing more.	170,445
485	client_side_validations (3.1.4) Client Side Validations	170,001
486	yamler (0.1.0) yamler was developed by: markbates	169,260
487	padrino-core (0.10.7) The Padrino core gem required for use of this framework	169,259
488	declarative_authorization (0.5.6) declarative_authorization is a Rails plugin for maintainable authorization based on readable auth...	168,467
489	http_configuration (1.0.4) Gem that provides the ability to set defaults for proxies and timeouts for Net::HTTP. Simplifies ...	168,374
490	remotipart (1.0.2) Remotipart is a Ruby on Rails gem enabling remote multipart forms (AJAX style file uploads) with ...	168,060
491	ntlm-http (0.1.1) Ruby/NTLM HTTP provides NTLM authentication over http.	167,913
492	vagrant (1.0.5) Vagrant is a tool for building and distributing virtualized development environments.	167,895
493	routo (0.0.4) Sending sms with Routo Messaging HTTP API.	167,665
494	globalize3 (0.2.0) Rails I18n: de-facto standard library for ActiveRecord 3 model/data translation.	167,405
495	guard-cucumber (1.2.0) Guard::Cucumber automatically run your features (much like autotest)	167,341
496	churn (0.0.24) High method and class churn has been shown to have increased bug and error rates. This gem helps ...	167,211
497	do_mysql (0.10.8) Implements the DataObjects API for MySQL	166,962
498	garb (0.9.1) Google Analytics API Ruby Wrapper	166,659
499	rush (0.6.8) A Ruby replacement for bash+ssh, providing both an interactive shell and a library. Manage both ...	166,575
500	directory_watcher (1.4.1) The directory watcher operates by scanning a directory at some interval and generating a list of ...	166,312

General procedures for system feature enhancement

Feature Spec - Identify the goal.

• Feature(s) request received.
• Breakdown requests into small request items.
• Clarity requirements if necessary.

Design & Planning - Draw a direction map.

• List out the required changes.
• List out new functionality/methods needed.
• List out side effects.
• Reuse existing functionalities if possible.
• Ensure DRY (Don't repeat yourself)
• Open for future changes.
• Double check all usage scenarios.
• Run new features on mind map.
• Feasibility studies if necessary.
• Division of Labour.
• Estimate schedule.

Implementation - Work through the map.

• Create test cases.
• Implementation.
• Refine the feature and details during implementation.

Testing

• QA test
• User Acceptance test

Demo

• User demo
• Get user feedback
• Go back to feature spec cycle upon user feedback.

Staging Release

• Deployment to stage server
• Pre-release final checks.

Production Release

• Release to production.

User Training

• Conduct user training on new features.

Practices of Agile Development

Attitudes

• Blame doesn't fix bugs. 
  
• Don't code in isolation, do code reviews.
• Use unit tests.
• Do not code in quick and dirty ways.

Continuous Learning

• No need to be specialized on every technologies.  But need to known the industry trend.
• Share knowledge with the team.  Let everyone learn from each other.
  
• Learning new technologies may have to give up the old ones.
• Ask why and dig into the root of solution.
• Keep development cycle in a good pace.  Design -> Implementation -> Testing -> Code Review -> Release.

Customer Oriented

• Let customer do the business decisions.  Understand customers needs.
  
• Design in two phrases:
• Macro design:  Give the direction of implementations.  Not down to the details.
  
• Micro design:   Ways on solve problems during implementation.
• A good design should be correct but not precise.
• Blindly picking a framework is like having kids to save taxes.
• Don't build what you can download.
• Base on project requirement, select the right tools and technologies.
• Checked-in code (on master branch) is always ready for action.
• Never accept big-bang integration.  Should integrate codes more often.
  
• Automate QA testing.
• Get continuous feedback from customers.  Ensure the project is on the right direction.
• Release the smallest usable feature in project development life cycle.
  

Feedback

• Use unit tests to provide coding feedback.
• TDD - Write tests before writing code.
• Good design doesn't mean more classes.
• Target for simple design.
• Ensure code works on different platform (if applicable).

Agile

• Write clean code when speaks its purpose or function.
• PIE - Program Intently and Expressively.
  
• Let code speak for itself.  Comments only helps.  Don't comment to cover up.
  
• DRY - Don't Repeat Yourself.
• Carefully pick meaningful variable and method names.
• No best solution.
• Always code in clean, simple and easy for maintenance way.
• Simple is not simplistic.
• Do not use complicated design pattern unless it's absolutely necessary and with good reasons.
• Use inheritance for is-a; Use delegation for has-a or uses-a.

Daily Practice

• Don't get burn twice.  Keep a log book.
• Treat warning as an error.  Solve it.

Collaboration

• Daily short (stand) meeting (10 - 15 minutes).
• Always know what others are working on.
  
• Simple questions for everyone:
• What's yesterday achievements?
• What's today's plan?
• Any obstacles?
• Do not discuss the questions during meeting.  Details should be discussed after meeting.
  
• Meeting holds in the morning after everyone settle down.
• Advantages of daily meetings:
• Know the existing problems and progress.
• May reallocate resources if needed.
• Let everyone know what others are doing.
• May know who can provide a quick solution to a problem.
• Keep everyone in a good working pace.
• You can't code in PowerPoint.
  
• Architect should be able to code.
• Code should be reviewed and refactored if necessary.
• Every project member should shift to handle different part of the project.
• Knowledge grows when given.
• Inspire rather than given instructions.
• Code review basic check points:
• Easily readable and understandable?
• Any obvious mistakes?
• Is the code give negative effect on other functionality?
• Any repeated code?
• Can be improved or refactored?
• Unless there's obvious improvement after refactoring, do not change others code.
• Report progress and problems.

Asus laptop factory reset

Press F9 when power on.

Rails paginate inner join and outer join

some_scope.paginate \
:per_page => 20, :page => page,
:joins => :table_A, # will be inner joined
:include => :table_B, # will be outer joined
:conditions => ...

Behavior-driven development framework for testing Javascript code

http://pivotal.github.com/jasmine/

from PivotalLabs

bash customization

$PS1="\h:\W \u~[\A]\$"         #prompt
alias ll='ls -alG'

(in .bash_login)

Outlook 2010 on Windows 7 - Relocate gmail pst file

1. Close Outlook.
2. Copy the pst folder to target location.
3. Rename the origin pst outlook folder to outlook_2
4. Create a symbolic link from origin outlook to target location.

    > mklink /D c:\...\Outlook D:\Outlook

5. Done.

General steps to setup an existing Ruby on Rails project from Git repository

1. Git clone the source
2. Update configuration files, such as config/database.yml and/or config/config.yml
3. Create database accordingly.
4. Install project gems: $ bundle install
5. Install dependency packages.  e.g. ImageMagick for paperclip gem.
    $ brew install imagemagick
6. Prepare database: $ rake db:migrate
7. Prepare test: $ rake db:test:prepare
8. Run test: $ rake test

Customize macvim/gvim for Ruby on Rails development

1. Install Janus - https://github.com/carlhuda/janus

2. Get color scheme. e.g. http://www.vim.org/scripts/script.php?script_id=1891
    Copy vividchalk.vim to ~/.vim/colors

3. ~/.gvimrc.after
set guifont=Monaco:h13
set stal=2 " turn on tabs by default
set noanti
colorscheme vividchalk


4. ~/.vimrc.before

nmap <F3> :vimgrep /<C-R><C-W>/ ./**/*.rb ./**/*.erb

Solve the pg_dump version mismatch error

After updating postgresql, the server runs on the latest version, 9.2.0.
Whilst, pg_dump in /usr/bin remains on version 9.1.4.

To solve this problem. Remove /usr/bin/pg_dump and create symbolic link
to new pg_dump in /usr/local/bin/pg_dump.

i.e. $ sudo ln -s /usr/local/bin/pg_dump /usr/bin/pg_dump

Done.

Free Git client on Mac

http://www.sourcetreeapp.com/

Setup or update postgresql on Mac

Remove any previous version:
brew rm postgresql --force

Installation
brew update
brew install postgresql

Initialise a database.
initdb /usr/local/var/postgres

Set to start at login with (in one line below)
mkdir -p ~/Library/LaunchAgents
 

cp /usr/local/Cellar/postgresql/[x.x.x]/[....].postgres.plist ~/Library/LaunchAgents/


launchctl load -w ~/Library/LaunchAgents/org.postgresql.postgres.plist

OR

Add aliases to .bashrc to start and stop the server:
alias pgs='pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start'

alias pgq='pg_ctl -D /usr/local/var/postgres stop -s -m fast'

Postgresql client verification:
$which psql
$ls -al /usr/local/bin/psql 
/usr/local/bin/psql -> ../Cellar/postgresql/.../bin/psql

(Edit ~/.bash_profile : PATH=/usr/local/bin:$PATH)


Update postgresql tools versions
Tools like psql or pg_dump may not be update by the installations.
Just remove old version pg_* in /usr/bin, and create symbolic link to new ones in /usr/local/bin.

bash config startup sequence

For Login shells (subject to the -noprofile option):

On logging in:
If `/etc/profile' exists, then source it.

If `~/.bash_profile' exists, then source it,
else if `~/.bash_login' exists, then source it,
else if `~/.profile' exists, then source it.

On logging out:
If `~/.bash_logout' exists, source it.

For non-login interactive shells (subject to the -norc and -rcfile options):
On starting up:
If `~/.bashrc' exists, then source it.

For non-interactive shells:
On starting up:
If the environment variable `ENV' is non-null, expand the variable and source the file named by the value. If Bash is not started in Posix mode, it looks for `BASH_ENV' before `ENV'.

So, typically, your `~/.bash_profile' contains the line
`if [ -f `~/.bashrc' ]; then source `~/.bashrc'; fi' after (or before) any login specific initializations.

If Bash is invoked as `sh', it tries to mimic the behavior of `sh' as closely as possible. For a login shell, it attempts to source only `/etc/profile' and `~/.profile', in that order. The `-noprofile' option may still be used to disable this behavior. A shell invoked as `sh' does not attempt to source any other startup files.

When Bash is started in POSIX mode, as with the `-posix' command line option, it follows the Posix 1003.2 standard for startup files. In this mode, the `ENV' variable is expanded and that file sourced; no other startup files are read.

Clean setup ruby ree on Mountain Lion

http://blog.teamtreehouse.com/installing-ruby-rails-and-mysql-on-os-x-lion

http://ryanbigg.com/2011/06/mac-os-x-ruby-rvm-rails-and-you/

http://coderwall.com/p/fywjrw

xcode - app store
(need to install after download completed: open xcode in application, ...)
xocde - go to preference -> download -> command line tools
(try $gcc -v to ensure it works.)

Install the followings using su login:
homebrew - http://mxcl.github.com/homebrew/

gcc (non-LLVM) -
brew tap homebrew/dupes
brew install apple-gcc42

xquartz - apple's X11
http://xquartz.macosforge.org/landing/

git - brew install git

Install the followings using local login:
rvm - $ curl -L https://get.rvm.io | bash -s stable --ruby

CPPFLAGS=-I/opt/X11/include CC=/usr/local/bin/gcc-4.2 rvm install --force ree

Install the followings using su login:
postgresql - brew install postgresql
or
mysql - brew install mysql

Ruby - Extends module class methods using 'extend self'

module A
    extend self

    def say_hello
        'A say hello'
    end
end

module B
    extend A
end

A.say_hello # => "A say hello"
B.say_hello # => "A say hello"

Ruby - use include to append both class and instance methods

module B
  def self.included(base)
    base.extend ClassMethods
  end  

  def say_hello
    'instance hello'
  end
 
  module ClassMethods
    def say_hello
      'class hello'
    end 
  end 
end 

class A
  include B
end 

A.say_hello  # => "class hello"

A.new.say_hello # => "instance hello"

Case study - Hardware for etsy.com

Source: http://codeascraft.etsy.com/2012/08/31/what-hardware-powers-etsy-com/

What Hardware Powers Etsy.com?

Posted by lozzd | Filed under engineering, infrastructure, operations

Traditionally, discussing hardware configurations when running a large website is something done inside private circles; and normally to discuss how vendor X did something very poorly, and vendor Y’s support sucks.

With the advent of the “cloud”, this has changed slightly. Suddenly people are talking about how big their instances are, and how many of them. And I think this is a great practice to get in to with physical servers in datacenters too. After all, none of this is intended to be some sort of competition; it’s about helping out people in similar situations as us, and broadcasting solutions that others may not know about… pretty much like everything else we post on this blog.

The great folk at 37signals started this trend recently by posting about their hardware configurations after attending Velocity conference… one of the aforementioned places where hardware gossiping will have taken place.

So, in the interest of continuing this trend here’s the classes of machine we use to power over $69.5 million of sales for our sellers in July

Database Class

As you may already know, we have quite a few pairs of MySQL machines to store our data, and as such we’re relying on them heavily for performance and (a certain amount of) reliability.

For any job that requires an all round performant box, with good storage, good processing power, and a good level of redundancy we utilise HP DL380 servers. These clock in at 2U of rack space, 2x 8 core Intel E5630 CPUs (@ 2.53ghz), 96GB of RAM (for that all important MySQL buffer cache) and 16x 15,000 RPM 146GB hard disks. This gives us the right balance of disk space to store user data, and spindles/RAM to retrieve it quickly enough. The machines have 4x 1gbit ethernet ports, but we only use one.

Why not SSDs?

We’re just starting to test our first round of database class machines with SSDs. Traditionally we’ve had other issues to solve first, such as getting the right balance of amount of user data (e.g. the amount of disk space used on a machine) vs the CPU and memory. However, as you’ll see in our other configs, we have plenty of SSDs throughout the infrastructure, so we certainly are going to give them a good testing for databases too.

A picture of our various types of hardware, with the HP to the left/middle and web/utility boxes on the right

Web/Gearman Worker/Memcache/Utility/Job Class

This is a pretty wide catch all, but in general we try and favour as few machine classes as possible, so a lot of our tasks from handling web traffic (Apache/PHP) to any box that performs a task where there are many of them/redundancy is solved at the app level we generally use one type of machine. This way hardware re-use is promoted and machines can change roles quickly and easily. Having said that, there are some slightly different configurations in this category for components that are easy to change, e.g. amount of memory and disks.

We’re pretty much in love with this 2U Supermicro chassis which allows for 4x nodes that share two power supplies and 12 3.5″ disks on the front of the chassis

Supermicro Chassis with 4 easily serviceable nodes

A general configuration for these would be 2x 8 core Intel E5620 CPUs (@ 2.40ghz), 12GB-96GB of RAM, and either a 600GB 7200pm hard disk or an Intel 160GB SSD.

Note the lack of RAID on these configurations; We’re pretty heavily reliant on Cobbler and Chef, which means rebuilding a system from scratch takes just 10 minutes. In our view, why power two drives when our datacenter staff can replace the drive and rebuild the machine and have it back in production in under 20 minutes? Obviously this only works where it is appropriate; clusters of machines where the data on each individual machine is not important. Web servers, for example, have no important data since logs are sent constantly to our centralised logging host, and the web code is easily deployed back on to the machine.

We have Nagios checks to let us know when the filesystem becomes un-writeable (and SMART checks also), so we know when a machine needs a new disk.

Each machine has 2x 1gbit ethernet ports, in this case we’re only using one.

Hadoop

In the last 12 months we’ve been working on building up our Hadoop cluster, and after evaluating a few hardware configurations ended up with a very similar chassis design to the one used above. However, we’re using a chassis with 24x 2.5″ disk slots on the front, instead of the 12x 3.5″ design used above.

Hadoop nodes… and a lot of disk lights

Each node (with 4 in a 2U chassis) has 2x 12 core Intel E5646 CPUs (@ 2.40ghz), 96GB of RAM, and 6x 1Tb 2.5″ 7200rpm disks. That’s 96 cores, 384GB of RAM and 24TB per 2U of rack space.

Our Hadoop jobs are very CPU heavy, and storage and disk throughput is less of an issue hence the small amount of disk space per node. If we had more I/O and storage requirements, we had also considered 2U Supermicro servers with 12x 3.5″ disks per node instead.

As with the above chassis, each node as 2x 1gbit ethernet ports, but we’re only utilising one at the minute.

This graph illustrates the power usage on one set of machines showing the difference between Hadoop jobs running and not

Search/Solr

Just a month ago, this would’ve been grouped into the general utility boxes above, but we’ve got something new and exciting for our search stack. Using the same chassis as in our general example, but this time using the awesome new Sandy Bridge line of Intel CPUs. We’ve got 2x 16 core Intel E5-2690 CPUs in these nodes, clocked at 2.90ghz, which gives us machines that can handle over 4 times the workload of the generic nodes above, whilst using the same density configuration and not that much more power. That’s 128x 2.9ghz CPU cores per 2U (granted, that includes HyperThreading).

This works so well because search is really CPU bound; we’ve been using SSDs to get around I/O issues in these machines for a few years now. The nodes have 96GB of RAM and a single 800GB SSD for the indexes. This follows the same pattern of not bothering with RAID; The SSD is perfectly fast enough on it’s own, and we haveBitTorrent index distribution which means getting the indexes to the machine is super fast.

Less machines = less to manage, less power, and less space.

Output of the “top” command with 32 cores on Sandy Bridge architecture

Backups

Supermicro wins this game too. We’re using the catchily named 6047R-E1R36N. The 36 in this model number is the important part… this is a 4u chassis, with 36x 3.5″ disks. We load up these chassis with 2TB 7200rpm drives, which when coupled with an LSI RAID controller with 1gb of battery backed write back cache gives a blistering 1.2 gigabytes/second sequential write throughput and a total of 60TB of usable disk space across two RAID6 volumes.

36 disk Supermicro chassis. Note the disks crammed into the back of the chassis as well as the front!

Why two RAID6 volumes? Well, it means a little more waste (4 drives for parity instead of 2) but as a result of that you do get a bit more resiliency against losing a number of drives, and rebuild times are halved if you just lose a single drive. Obviously RAID monitoring is pretty important, and we have checks for either SMART (single disk machines) or the various RAID utilities on all our other machines in Nagios.

In this case we’re taking advantage of the 2x 1gbit ethernet connections, bonded together to the switch to give us redundancy and the extra bandwidth we need. In the future we may even run fiber to these machines, to get the full potential out of the disks, but right now we don’t get above a gigabit/second for all our backups.

Special cases

Of course there are always exception to the rules. The only other hardware profile we have is HP DL360 servers (1u, 4x 2.5″ 15,000rpm 146GB SAS disks) which is for roles that don’t need much horsepower, but we deem important enough to have RAID. For example, DNS servers, LDAP servers, and our Hadoop Namenodes are all machines that don’t require much disk space, but need RAID for extra data safety than our regular single disk configurations. 

Networking

I didn’t go into too much detail on the networking side of things in this post. Consider this part 1, and watch this space for our networking gurus to take you through our packet shuffling infrastructure at a later date.

Case study - Ruby on Rails hardware spec

Source:http://37signals.com/svn/posts/3202-behind-the-scenes-the-hardware-that-powers-basecamp-campfire-and-highrise

Application Servers
All of our Ruby/Rails application roles run on Dell C Series 5220 servers. We chose C5220 servers because they provide high density, high performance, and low cost compute sleds at a decent cost point. The C5220 sleds replaced invidual Dell R710 servers which consumed a greater amount of power and rack space in addition to offering expandability we were not utilizing.

We use an 8 sled configuration with E31270 3.40GHz processors, 32/16G of ram, an LSI raid card and 2 non Dell SSDs. (For those of you thinking of ordering these … get the LSI raid card. The built in Intel raid is unreliable.) Each chassis with 8 sleds takes up 4U of rackspace: 3 for the chassis and 1 for cabling.

Job / Utility Servers
We use a combination of C6100 and C6220 servers to power our utility/jobs and API roles. We exclusively use the 4 sled version (of each) which means we get 4 “servers” in 2U. Each sled has 2x X5650 processors, 48-96G of ram, 2-6 ssds, and 4×1G or 1×10G network interfaces. This design allows to have up to 24 disks in a single chassis while consuming the same space as a single R710server (which holds 8 disks max).

Search
For Solr we run R710s filled with SSDs. Each instance varies, but a common configuration is 2x E5530 processors, 48G of ram, 4-8 ssds, and 4×1g network interfaces. For Elastic Search we run a mix of Poweredge 2950 servers and C 5220 sleds with 12-16G of ram and 2×400G ssds in a raid 1.

Database and Memcache/Redis Servers
For Database roles we use R710s with 2x X5670 processors, 1.2TB Fusion-IO duo cards and varying amounts of memory. (Varies based on the database size.) We also have a number of older R710s powering Memcache and Redis instances. Each of these has has 2x E5530 processors and 2-4 disks with 4×1G network interfaces.

Storage
We have around 400TB / 9 nodes of Isilon 36 and 72NL storage. We serve all of the user uploaded content off this storage with backups to S3.

OS Choice
Database servers run RHEL or Centos 6 while application and utility servers run Ubuntu LTS.

Remote desktop client on mac

http://www.microsoft.com/mac/remote-desktop-client

How to create a bootable USB stick on Windows

Source: http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows

To run Ubuntu from a USB stick, the first thing you need to do is insert a USB stick with at least 2GB of free space into your PC.

The easiest way to put Ubuntu onto your stick is to use the USB installer provided at pendrivelinux.com. You’ll need to download and install and follow the instructions.

Download Pen Drive Linux's USB Installer

Log in with open accounts

Google: https://developers.google.com/accounts/docs/OpenID
Facebook: http://developers.facebook.com/docs/guides/web/
Twitter: https://dev.twitter.com/docs/auth/sign-twitter

OAuth - Open standard for authorization

Ruby Gem - https://github.com/intridea/omniauth

Rails 3 - Model's nested attributes in form

When a rails form contain a model and its nested attributes, use "accepts_nested_attributes_for" to get parameter from the form.

e.g.

In a car model,
...
has_one :engine_spec
accepts_nested_attributes_for :engine_spec, allow_destroy => true
...

In a car form,
...
<%= form_for(@car, :multipart => true) do |f| %>
   <%= f.text_field :model_name %>
...
   <%= f.fields_for :engine_spec do |spec| %>
        <%= spec.text_field :capacity %>
...

Note:  Should declare engine_spec in car controller:
@car.engine_spec = EngineSpec.new

Git re-initialize fix after corruption

Today, a project directory was somehow corrupted and cannot add new file nor commit modified files to the local repository. 
With error like these:

$ git add .
error: insufficient permission for adding an object to repository database .git/objects

error: clickthecity.rb: failed to insert into database
error: unable to index file clickthecity.rb
fatal: updating files failed

It's found that some directories under .git/objects were owned by root.  Maybe some commits were done under the root access.
After a few tries in vein, I do just re-initialize the local git repository.

$ sudo rm -rf .git
$ git init
$ git add .
$ git remote add origin [your_server]:[dir]
$ git commit -a -m "..."
$ git pull origin master

And do some code merging.

$ git push origin master

Done.