Re: Comparing fields in the controller

when a new blog is created... I know it's probably wrong to do so, but it is easier for me to....

You're right - it is wrong. Although it is technically possible, it would cause many side effects you would have to solve in app code. Follow cake conventions and cake will help you to do what you want behind the scene. Don't fight cake as a newbie, let it help you :-)
 
Besides, from the architectural point of view, "is this user authorized to call this action" should be decided before action is called, it is work for isAuthorized() callback, for example see how it is done here:
http://book.cakephp.org/2.0/en/tutorials-and-examples/blog-auth-example/auth.html#authorization-who-s-allowed-to-access-what

In your case, where BlogPost belongsTo Blog belongsTo User, your custom method BlogPost::isOwnedBy() would test Blog.user_id - you _can_ set conditions for "parent" model record associated as belongsTo, therefore adding field user_id to blog_posts table is not necessary.

Sorry if I've wasted your time with newbie issues :-P

No need to be sorry, this is right place to ask questions. Well, one of them ;-) http://ask.cakephp.org/

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