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CanCanCan: Defining Abilities

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General
Sascha M. Sascha M.

I'm using the CanCanCan gem. According to the documentation you can define abilities. That is working for me. What I want to do is to limit the access to records, that contain a value. Something like:

"can :crud, Order, :brand == nil"

is not working

A User should only be allowed to see the record, if the brand-column of the Order table is empty. As my example doesn't work apparently.. How would you do it?

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