ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection答案

【问题标题】：ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflectionActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection
【发布时间】：2015-07-13 11:10:47
【问题描述】：

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，出现此错误：

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？

【问题讨论】：

如果有效，请接受我的回答:)

标签： ruby-on-rails nested-attributes rails-models

【解决方案1】：

您的关联设置有误。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

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