The one I remember the most is why $model->save() not working
I hear it at the chat or forum every day...
Maybe you list here the most common question you meat here at the forum... and I can create wiki section with those questions with answers...
So from what I can remember:
1. why $model->save() not working
2. how to connect to database in controller
3. how to change site/action?id=123 to site/action/id
4. Call to a member function getAttributes() on a non-object ...
5. why ActiveForm not doing ajax validation
6. how to use find / findByAttributes etc.
7. how to encrement decrement counter via query builder

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