What's the best way to model these database associations?

So I have the following models:

• User
• Business
• Coupons
• Deals
• Redeemable
• owner

I am using the owner model to associate various other models such as business coupons deals and redeemable to the user model.

The redeemable model is used because I want to generate a unique code for each user that uses a coupon/deal in order to limit one per user as well as the amount in total.

I suppose maybe I don't need two models for coupon and deal and I just need one because a deal is more like a special type of coupon.

So heres the models after a revision:

Business
   has_many :owners, :as => :ownable, :dependent => :destroy
   has_many :coupons, :dependent => :destroy

Coupon
   belongs_to :business
   has_many :redeems
   # also has a special column for denoting weather it's a 
   # normal coupon or a daily deal kind of coupon

Redeem
   belongs_to :coupon
   has_one :owner, :as => :ownable, :dependent => :destroy

Owner
   belongs_to :user
   belongs_to :ownable, :polymorphic => 开发者_如何学JAVAtrue

and for the user model I am just totally lost but here's what I want in pseudo code edit just for all those who may have same problem here's how i set up the user model

User
   has_many :owners
   has_many :businesses, :through => :owners, 
              :source => business, :source_type => 'Business'
   has_many :redeems, :through => :owners, :source=> :redeem, 
              :source_type => 'Redeem'

   has_many :coupons, :through => :redeems, 
              :source => :coupon, :source_type => 'Coupon'

I just don't understand how to associate the coupons with the User model because I did a polymorphic association for owning things.

I would say that a coupon is essentially a contract, a certificate, an instance of a deal. When a person buys a coupon, they actually buy a legal contract that some business will deliver on a promised product or service described in the contract (deal). So with that in mind, here is an attempt to model this.