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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 115 | Caching in Rails 2.1 | 78 comments | 8 minutes | Jun 23, 2008 |
| 108 | named_scope | 69 comments | 11 minutes | May 19, 2008 |
| 109 | Tracking Attribute Changes | 47 comments | 7 minutes | May 21, 2008 |