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ruby-on-railsmodel-associations
Victor Doh Kim
Victor Doh Kim

Reputation: 25

Ruby Rails Record Associations(has_many :through)

Hi I am creating 3 models with ruby rails But I have some problem. Here's my model code

class Company < ActiveRecord::Base
    has_many :pendings
    has_many :products, :through => :pendings
end

class Product < ActiveRecord::Base
  has_many :pendings
  has_many :companies, :through => :pendings
end

class Pending < ActiveRecord::Base
  belongs_to :company
  belongs_to :product
end

I wanted make it company can have many Products through Pending vice versa, It worked well, but is there any way to set only 1 pending model between company and product.

Here's my currently model

I want to make it like this

Upvotes: 1

Views: 33

Answers (1)

toddmetheny
toddmetheny

Reputation: 4443

One option: you could leave the association as is, but add the following validation to pending.rb

validates :company_id, uniqueness: {scope: :product_id}

see more here: rails validation docs

This will ensure that you can only have one pending per company and product...but many pendings for the companies with regard to other products.

Upvotes: 1

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