Ruby on Rails development notes, tips, practices

Development

• Performance tuning tools:
• New Relic
• Useful tips:
• Use rails console to counter check the SQL statements being executed.

Testing

• Unit tests should be written in a way that adding new records in test fixtures shouldn't affect the previous test results.  
• New test fixtures should be added in a way that they should link to existing fixture data so as to avoid breaking existing test cases.

Quality Assurance

• Besides unit, functional and integration test within rails framework.  Create automated browser test using tools like "Selenium" over test/real data.

Maintenance

• Avoid using unnecessary code reflection.  It's not good for performance and maintenance.