Rails: 使用 class 指定关系中的模型时未初始化常量 Model::RenamedAssociation

Question

我有 3 个表，费用、交易和 Charges_Transactions。

我不得不重命名我模型上的关联，因为现有的交易方法干扰了关联。参见 this article

class Charge < ActiveRecord::Base
  has_and_belongs_to_many :payment_transactions, join_table: "charges_transactions", foreign_key: "charge_id",
      association_foreign_key: "transaction_id", class: 'Transaction'
end

class Transaction < ActiveRecord::Base
  has_and_belongs_to_many :charges, join_table: "charges_transactions", foreign_key: "transaction_id",
      association_foreign_key: "charge_id"
end

@charge.payment_transactions

现在，当我尝试访问任何收费的关联交易时，我收到错误消息：

uninitialized constant Charge::PaymentTransaction

Answer 1

尝试更改： class: 'Transaction' 到： class_name: 'Transaction'

来自http://guides.rubyonrails.org/association_basics.html

If the name of the other model cannot be derived from the association name, you can use the :class_name option to supply the model name. For example, if an order belongs to a customer, but the actual name of the model containing customers is Patron, you'd set things up this way:

class Order < ActiveRecord::Base belongs_to :customer, class_name: "Patron" end

Rails: 使用 class 指定关系中的模型时未初始化常量 Model::RenamedAssociation

Rails: uninitialized constant Model::RenamedAssociation when using class to specify model in relationship

model

ruby-on-rails

associations

has-and-belongs-to-many