If the User Model has the foreign key "extension_id" it's not has_on :extension it has to be belongs_to :extension
foreign keys are always on the belongs_to side. has_one/has_many has no foreign keys.
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|---|---|---|---|---|
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| relationships quickie | 0 | 86 | January 7, 2009 | |
| One-to-One Associations and REST | 0 | 126 | March 3, 2007 | |
| Difference between has_one and belongs_to | 0 | 154 | November 19, 2007 | |
| foreign key question | 5 | 109 | March 21, 2008 |