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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 154 | Polymorphic Association (revised) | 99 comments | 11 minutes | May 19, 2012 |
| 77 | Destroy without JavaScript (revised) | 48 comments | 8 minutes | Jun 16, 2012 |
| 165 | Edit Multiple | 51 comments | 14 minutes | Jun 08, 2009 |
| 154 | Polymorphic Association | 125 comments | 8 minutes | Mar 23, 2009 |
| 139 | Nested Resources | 66 comments | 10 minutes | Dec 08, 2008 |
| 124 | Beta Invitations | 80 comments | 22 minutes | Aug 25, 2008 |