$distinctBookCategories = $this->Book->find('list',array(
'fields'=>array('category_id'),
'conditions'=>array(
'NOT'=>array('category_id'=>null),
'{Other book conditions go here}'
),
'group'=>'category_id'
));
I am not sure what you are looking to do here. But this is the code I use
to pull unique ids.
Then you can loop through them, and save them to what ever table you want.
Happy Coding.
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