I have a polymorphic relationship issue that i'm trying to solve. But i dont know how to go about it or if im even on the right track. I will keep it as short and simple as possible.

I'm trying to create settings for a very dynamic system that i'm working on. This is what i have so far.

settings (definition settings)
	id
	name

setting_values (hold the setting values with a poly relationship to its owner)
	id
	value
	setting_id
	owner_id
	owner_type

clients (definition clients, clients are setting value owners)
	id
	name

users (definition users, clients are setting value owners)
	id
	name

categories (definition categories)
	id
	name

category_client (pivot table, holds which clients have which categories)
	id
	category_id
	client_id

category_user (pivot table, holds which users have which categories)
	id
	category_id
	user_id

So this is my structure (simplified), now to my question. I want to be able to set a setting value for a specific client, on a specific category. But this should of course not be inherited by the users or other clients.

How do i make a category_client (pivot table) a owner_type? Or is that even the right way to go about it? What am i missing here? As far as i can see i have a many-to-many-to-many relationship.

Hope somebody can point me on the right track here.