Ruby on Rails

Hello,

I've been googling for about two hours already but not successful yet so
I hope you guys can help me out.

I need some kind of n:m polymorphic relation like this:
building_types: living, shops
block_types: residential, commercial

activity_types: act1, act2

So now I need a connection table e.g. activity_scope so I can for
example allow
act1 only for living and residential and act2 for commercial and shops

Any ideas?
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