[Rails] Cancan question - create rule issue

Hi, RoR newbie here. Fairly new, anyway. :). I have a cancan question I'm hoping someone can help me with. I have two models - ProposalRequest and Proposal. Each ProposalRequest can have many Proposals, but a given user can submit only one Proposal for each ProposalRequest. I can't figure out how to define the rule in ability.rb for the create action. Can someone help?

Thanks

Stan McFarland

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