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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 115 | Model Caching (revised) | 426 comments | 12 minutes | May 13, 2013 |
| 22 | Eager Loading (revised) | 223 comments | 7 minutes | Mar 20, 2013 |
| 63 | Model Name in URL (revised) | 85 comments | 9 minutes | Dec 16, 2012 |
| 162 | Tree-Based Navigation (revised) | 93 comments | 10 minutes | Dec 01, 2012 |
| 103 | Site-Wide Announcements (revised) | 95 comments | 11 minutes | Nov 12, 2012 |
| 59 | Optimistic Locking (revised) | 135 comments | 8 minutes | Aug 04, 2012 |
| 16 | Virtual Attributes (revised) | 71 comments | 11 minutes | Jul 20, 2012 |
| 154 | Polymorphic Association (revised) | 99 comments | 11 minutes | May 19, 2012 |
| 196 | Nested Model Form (revised) | 228 comments | 11 minutes | Apr 19, 2012 |
| 26 | Hackers Love Mass Assignment (revised) | 66 comments | 6 minutes | Mar 08, 2012 |
| 17 | HABTM Checkboxes (revised) | 94 comments | 6 minutes | Dec 22, 2011 |
| 120 | Thinking Sphinx (revised) | 44 comments | 10 minutes | Dec 09, 2011 |