Question

我有4个模型：项目，子项目，子项，用户：

    class User < ActiveRecord::Base
     has_many :projects    
    end

    class Subproject < ActiveRecord::Base
      belongs_to :project
      has_many :children, :dependent => :destroy
      accepts_nested_attributes_for :children, :allow_destroy => true
    end

    class Project < ActiveRecord::Base
     belongs_to :user
     has_many :subprojects,  dependent: :destroy
    end

    class Child < ActiveRecord::Base

    end

问题是：

def sendinfoAll
  @user = User.all
  @children = Children.all 
  @user.each do |user|
    @children.each do |child| 
      if child.user_id == user.id
        UserMailer.welcome_email(user, child.name).deliver_now
      end
    end
  end
end

我想向所有用户发送电子邮件。但是，为什么我不能设置@children = Children.all？

我正在使用Rails 4.02

由于

Answer 1

您需要在下面一行中使用Child代替Children

@children = Children.all #wrong

@children = Child.all #correct

因为您需要使用 模型类名称 （即Child而非Children）来查询ActiveRecord。

未初始化的常量UsersController :: Children

1 个答案: