多态喜爱模型设置中的质量分配错误答案

【问题标题】：Mass assignment error in polymorphic favourite model setup多态喜爱模型设置中的质量分配错误
【发布时间】：2012-10-15 20:45:08
【问题描述】：

我正在尝试将收藏添加到我的应用中，以便用户可以选择喜欢的项目。

我尝试使用我在此处找到的代码：http://snippets.aktagon.com/snippets/588-How-to-implement-favorites-in-Rails-with-polymorphic-associations

这是我目前的情况：

user.rb

class User < ActiveRecord::Base
  has_many :projects
  has_many :favourites
  has_many :favourite_projects, :through =>  :favourites, :source => :favourable, :source_type => "Project"
end

project.rb

class Project < ActiveRecord::Base
  belongs_to :user
  has_many :tasks
  accepts_nested_attributes_for :tasks
  has_many :favourites, :as => :favourable
  has_many :fans, :through => :favourites, :source => :user
end

task.rb

class Task < ActiveRecord::Base
  belongs_to :project
end

favourite.rb

class Favourite < ActiveRecord::Base
  belongs_to :user
  belongs_to :favourable, :polymorphic => true
  attr_accessible :user, :favourable
end

favourite_spec.rb

require 'spec_helper'

describe Favourite do
  let(:user) { FactoryGirl.create(:user) }
  let(:project) { FactoryGirl.create(:project_with_task) }
  let(:favourite_project) do
    user.favourite_projects.build(favourable: project.id)
  end

  subject { favourite_project }

  it { should be_valid }

  describe "accessible attributes" do
    it "should not allow access to user_id" do
      expect do
        Favourite.new(user_id: user.id)
      end.to raise_error(ActiveModel::MassAssignmentSecurity::Error)
    end
  end

end

但当我运行测试时，user_id 测试通过但我得到it { should be_valid } 的以下内容：

Failure/Error: user.favourite_projects.build(favourable: project.id)
     ActiveModel::MassAssignmentSecurity::Error:
       Can't mass-assign protected attributes: favourable

我在测试中做错了吗？

或者我打电话给.build的方式？

或者在收藏模型上的attr_accessible？

希望有人能提供帮助！

【问题讨论】：

标签： ruby-on-rails-3 activerecord rspec polymorphic-associations mass-assignment

【解决方案1】：

解决了！

以下是问题中显示的必须更改的文件：

收藏夹.rb

class Favourite < ActiveRecord::Base
  belongs_to :user
  belongs_to :favourable, :polymorphic => true
  attr_accessible :favourable
end

favourite_spec.rb

require 'spec_helper'

describe Favourite do
  let(:user) { FactoryGirl.create(:user) }
  let(:project) { FactoryGirl.create(:project_with_task) }
  let(:favourite_project) do
    user.favourites.build(favourable: project)
  end

  subject { favourite_project }

  it { should be_valid }

  describe "accessible attributes" do
    it "should not allow access to user_id" do
      expect do
        Favourite.new(user_id: user.id)
      end.to raise_error(ActiveModel::MassAssignmentSecurity::Error)
    end
    it "should not allow access to user" do
      expect do
        Favourite.new(user: user)
      end.to raise_error(ActiveModel::MassAssignmentSecurity::Error)
    end
  end

end

【讨论】：