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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 196 | Nested Model Form (revised) | 228 comments | 11 minutes | Apr 19, 2012 |
| 196 | Nested Model Form Part 1 | 184 comments | 11 minutes | Jan 11, 2010 |
| 162 | Tree-Based Navigation (revised) | 93 comments | 10 minutes | Dec 01, 2012 |
| 63 | Model Name in URL (revised) | 85 comments | 9 minutes | Dec 16, 2012 |
| 154 | Polymorphic Association | 125 comments | 8 minutes | Mar 23, 2009 |