Passing variables between AppController and Models / Access Auth data in Models

Hi all !

I need to implement a little complex user permissions over data in tables :

relations are similar to the following :

- user belongs to a customer

- book belongs to a customer

In order to keep it DRY and "fat model / slim controller", I thought I could just add something like :

// Book Model

$queryData['conditions']['customer_id']=$this->Auth->User['customer_id'];

But, I don't get how to access Auth parameters from the models.

The only way I found to pass this barrier is to send the user's customer_id via the $_SESSION which is quite .. err .. ugly :)

Any suggestions on how to pass parameters to all models ?

Note that I need the customer_id available for all models, not just "Book" ..

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