RSpec 验证在通过 Factory_girl 建立的关联上失败

Question

我确信尝试一些简单的事情而忽略了显而易见的事情。 Factory_Girl 不应该自动创建关联吗？如果是这样，为什么下面的“GET index”规范会失败，因为 event_id 为 nil？

事件 has_many :posts

#post.rb
  ...
  belongs_to :event
  validates :event_id, :presence => true
  ...

#factories.rb
Factory.define :event do |event|
  event.name "The Long Event Title"
end

Factory.define :post do |post|
  post.title "This is a post"
  post.association :event
end


#posts_controller_spec.rb
before(:each) do
  @attr = Factory.attributes_for(:post)
end

describe "GET index" do
  it "assigns all posts as @posts" do
    post = @user.posts.create(@attr)    ### <-- event_id not assigned?
    # post = FactoryGirl.create(:post)  ### <-- this doesn't work either
    get :index
    assigns(:posts).should eq([post])
  end
end

编辑： 其他规范示例：

describe "POST create" do
    describe "with valid params" do
      it "creates a new Post" do
        expect {
          post :create, :post => @attr, :event => Factory.create(:event)  <- fail
        }.to change(Post, :count).by(1)
      end

Answer 1

来自 FactoryGirl wiki：https://github.com/thoughtbot/factory_girl/wiki/Usage

# Attribute hash (ignores associations)
user_attributes = Factory.attributes_for(:user)

所以你没有得到 event_id，这就是它失败的原因。

另外，您说您尝试了 post = FactoryGirl.create(:post) 但您应该执行 post = Factory.create(:post) 这将使其正常工作。

也许在您的 before() 块中，您应该只创建并保存帖子，除非您有一个测试要求尚未保存它。

Answer 2

尝试更改

validates_presence_of :event_id

为

validates_presence_of :event