如何在Factory Girl中创建与has_many:through关系的关联？

Question

在我的模型中,我有以下设置:

class User < ActiveRecord::Base
  has_many :assignments
  has_many :roles, :through => :assignments
end


class Role < ActiveRecord::Base
  has_many :assignments
  has_many :users,  :through => :assignments
end

class Assignment < ActiveRecord::Base
  belongs_to :user
  belongs_to :role

  attr_accessible :role_id, :user_id
end

在我的factory.rb文件中,我有:

FactoryGirl.define do
  factory :user do
    sequence(:username) { |n| "user#{n}" }
    email { "#{username}@example.com" }
    password 'secret'
    password_confirmation 'secret'

    factory :admin  do
      ...
    end
  end

  factory :role do
    name 'Normal'
    value 'normal'
  end

  factory :assignment do
    ...
  end
end

我正在努力弄清楚我将如何添加一个角色:name =>"admin",:value =>"admin",到"user"块内的"admin"工厂,这样我就可以调用了

create(:admin)

在我的测试中,并拥有一个具有admin角色的用户.

谢谢你的期待.

Answer 1

对于这样的工厂,你需要使用工厂女孩的回调.试试这个:

FactoryGirl.define do
  factory :user do
    ...
  end

  factory :admin, :parent => :user do 
    after_create {|u| Factory(:assignment, :role => Factory(:role, :name => 'admin', :value => 'admin'), :user => u)}
  end

  factory :role do
    ...
  end

  factory :assignment do
    user {|a| a.association(:user)}
    role {|a| a.association(:role)}
  end
end