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| # | Name | Comments | Duration | Released |
|---|---|---|---|---|
| 394 | STI and Polymorphic Associations pro | 81 comments | 14 minutes | Nov 25, 2012 |
| 392 | A Tour of State Machines pro | 93 comments | 12 minutes | Nov 17, 2012 |
| 389 | Multitenancy with PostgreSQL pro | 112 comments | 11 minutes | Oct 27, 2012 |
| 388 | Multitenancy with Scopes pro | 120 comments | 12 minutes | Oct 20, 2012 |
| 355 | Hacking with Arel pro | 70 comments | 15 minutes | May 30, 2012 |
| 343 | Full-Text Search in PostgreSQL pro | 131 comments | 16 minutes | Apr 17, 2012 |