ruby-on-rails - NameError：has_many 的未初始化常量通过关系

Question

我似乎无法做到这一点。我有很多通过关系只是不工作。这是设置：

class Group < ActiveRecord::Base
  belongs_to :user

  has_many :groups_phone_numbers, :dependent => :destroy
  has_many :phone_numbers, through: :groups_phone_numbers

  attr_accessible :name
end

class PhoneNumber < ActiveRecord::Base
  belongs_to :user
  has_many :responses

  has_many :groups_phone_numbers
  has_many :groups, through: :groups_phone_numbers

  attr_accessible :label, :number
end

class GroupPhoneNumber < ActiveRecord::Base

  belongs_to :group
  belongs_to :phone_number

end

我已经尝试了复数的所有变体，但无法克服未初始化的错误。我究竟做错了什么？数据库中的表（连接模型）称为 groups_phone_numbers。

精确误差（g 是一个组）：

1.9.3p0 :002 > p g.phone_numbers
NameError: uninitialized constant Group::GroupsPhoneNumber

生成连接表的迁移：

class CreateGroupPhoneNumbersJoinTable < ActiveRecord::Migration
  def change
    create_table(:groups_phone_numbers) do |t|
      t.references :group
      t.references :phone_number

      t.timestamps
    end
  end
end

谢谢

Answer 1

只要您实际上不需要 GroupPhoneNumber，has_and_belongs_to_many 可能是您的最佳选择。代码是这样的：

class Group < ActiveRecord::Base
  belongs_to :user

  has_and_belongs_to_many :phone_numbers

  attr_accessible :name
end

class PhoneNumber < ActiveRecord::Base
  belongs_to :user
  has_many :responses

  has_and_belongs_to_many :groups

  attr_accessible :label, :number
end

class CreateGroupsPhoneNumbersJoinTable < ActiveRecord::Migration
  def change
    create_table(:groups_phone_numbers, :id => false) do |t|
      t.integer :group_id
      t.integer :phone_number_id
    end
  end
end