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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 63 | Model Name in URL (revised) | 85 comments | 9 minutes | Dec 16, 2012 |
| 139 | Nested Resources | 66 comments | 10 minutes | Dec 08, 2008 |
| 123 | Subdomains (revised) | 66 comments | 7 minutes | Jan 13, 2012 |
| 154 | Polymorphic Association | 125 comments | 8 minutes | Mar 23, 2009 |