扶手：为什么＆QUOT;的has_many ...：通过=＆GT; ...＆QUOT;协会结果＆QUOT; NameError：未初始化不断...＆QUOT; [英] Rails: Why "has_many ..., :through => ..." association results in "NameError: uninitialized constant ..."

问题描述

要前preSS，一个组可以有多个用户，并且用户可以属于多个组，我设置以下关联：

To express that a group can have multiple users, and a user can belong to multiple groups, I set the following associations:

class Group < ActiveRecord::Base
  has_many :users_groups
  has_many :users, :through => :users_groups
end

class User < ActiveRecord::Base
  has_many :users_groups
  has_many :groups, :through => :users_groups
end

class UsersGroups < ActiveRecord::Base
  belongs_to :user
  belongs_to :group
end

然而，当我键入：

However, when I type:

Group.find(1).users

我得到：

NameError: uninitialized constant Group::UsersGroup

我在做什么错了？

What am I doing wrong ?

推荐答案

类UsersGroups 应类UsersGroup 。 ActiveRecord的模型是奇异 - 的表具有多个

class UsersGroups should be class UsersGroup. ActiveRecord models are singular - the tables are plural.

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