RSpec，存根嵌套资源方法

Question

我有两个模型：

class Solution < ActiveRecord::Base
  belongs_to :owner, :class_name => "User", :foreign_key => :user_id
end

class User < ActiveRecord::Base
  has_many :solutions
end

我将解决方案嵌套在这样的用户中：

ActionController::Routing::Routes.draw do |map|
  map.resources :users, :has_many => :solutions
end

最后是我要指定的操作：

class SolutionsController < ApplicationController
  before_filter :load_user

  def show
    if(@user)
      @solution = @user.solutions.find(params[:id])
    else
      @solution = Solution.find(params[:id])
    end
  end

  private

  def load_user
    @user = User.find(params[:user_id]) unless params[:user_id].nil?
  end
end

我的问题是，我到底是如何指定 @user.solutions.find(params[:id]) 的？

这是我目前的规格：

describe SolutionsController do

  before(:each) do
    @user = Factory.create(:user)
    @solution = Factory.create(:solution)
  end

  describe "GET Show," do

    before(:each) do
      Solution.stub!(:find).with(@solution.id.to_s).and_return(@solution)
      User.stub!(:find).with(@user.id.to_s).and_return(@user)
    end

    context "when looking at a solution through a user's profile" do

      it "should find the specified solution" do
        Solution.should_receive(:find).with(@solution.id.to_s).and_return(@solution)
        get :show, :user_id => @user.id, :id => @solution.id
      end
    end
  end

但这给我带来了以下错误：

1)Spec::Mocks::MockExpectationError in 'SolutionsController GET Show, when looking at a solution through a user's profile should find the specified solution'
<Solution(id: integer, title: string, created_at: datetime, updated_at: datetime, software_file_name: string, software_content_type: string, software_file_size: string, language: string, price: string, software_updated_at: datetime, description: text, user_id: integer) (class)> received :find with unexpected arguments 
  expected: ("6")
  got: ("6", {:group=>nil, :having=>nil, :limit=>nil, :offset=>nil, :joins=>nil, :include=>nil, :select=>nil, :readonly=>nil, :conditions=>"\"solutions\".user_id = 34"})

谁能帮我解决我如何存根@user.solutions.new(params[:id])？

Answer 1

看起来我找到了自己的答案，但我将把它贴在这里，因为我似乎无法在网上找到很多关于此的内容。

RSpec 有一个名为 stub_chain 的方法：http://apidock.com/rspec/Spec/Mocks/Methods/stub_chain

这样可以很容易地存根类似的方法：

@solution = @user.solutions.find(params[:id])

通过这样做：

@user.stub_chain(:solutions, :find).with(@solution.id.to_s).and_return(@solution)

那么我可以像这样编写一个 RSpec 测试：

it "should find the specified solution" do
  @user.solutions.should_receive(:find).with(@solution.id.to_s).and_return(@solution)
  get :show, :user_id => @user.id, :id => @solution.id
end

我的规范通过了。但是，我仍然在这里学习，所以如果有人认为我在这里的解决方案不好，请随时发表评论，我会尝试完全正确。

乔

Answer 2

使用新的 RSpec 语法，您可以像这样对链进行存根

allow(@user).to receive_message_chain(:solutions, :find)
# or
allow_any_instance_of(User).to receive_message_chain(:solutions, :find)