的ActiveRecord :: HasManyThroughCantAssociateThroughHasOneOrManyReflection

Question

我有以下型号：

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

当我尝试使用nested_attributes添加记录时，我收到此错误：

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'

关系有什么问题？

Answer 1

关联设置 错误。它应该是

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

有关详细信息，请参阅这些Guides。