ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection

Question

I have the following models:

class Order < ActiveRecord::Base
  has_many :order_products, foreign_key: 'order_foreign_id'
  has_many :order_variation_values, through: :order_products
  accepts_nested_attributes_for :order_variation_values
end

class OrderProduct < ActiveRecord::Base
  has_many :order_variation_value
end

class OrderVariationValue < ActiveRecord::Base
  belongs_to :order_product, foreign_key: 'order_product_foreign_id'
end

When I try add record with nested_attributes I get this error:

ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection (Cannot modify association 'Order#order_variation_values' because the source reflection class 'OrderVariationValue' is associated to 'OrderProduct' via :has_many.): app/controllers/api/v2/orders_controller.rb:8:in 'create'

What is wrong with the relations?

score 3 · Accepted Answer · answered Jul 13 '15 at 11:25

Your association set-up is wrong. It should be

class Order < ActiveRecord::Base
  has_many :order_products, foreign_key: 'order_foreign_id'
  has_many :order_variation_values, through: :order_products
  accepts_nested_attributes_for :order_variation_values
end

class OrderProduct < ActiveRecord::Base
  belongs_to :order
  belongs_to :order_variation_value
end

class OrderVariationValue < ActiveRecord::Base
  has_many :order_products, foreign_key: 'order_foreign_id'
  has_many :orders, through: :order_products
end

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ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection

1 Answers1