linking models ruby on rails -

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I have 3 models: users, vendors and cars

I want the users to choose A car and it is added to the user's shopping list.

I have something in the car controller like this: 

  @user = User.find (params [: user]) @ cellar = vendor.fund (paraam [: vendor ]) @ Car = @ user.car.build (param [: car])

but the seller is not added. How can I do this?

BTW I have this: 

  class car <   
 
 
 in my model for the car:  
  @ Car.seller = @seller  after making the car, then do not know about  @ car.save  
 
 build @ cellar, you need to tell the car That he has a vendor, it really only knows that there is a user because you have created a car from the user. 
 
 You can also do this: 
 
  @car = Car.new @ car.Sellar = @celler@car.user = @user >

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