ruby-on-rails - RSpec， stub 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

我在用户中嵌套解决方案，如下所示:

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

最后，这是我正在尝试规范的操作:

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，我到底如何规范 @user.solutions.find(params[:id]) ?

这是我目前的规范:

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

但这让我出现以下错误:

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"})

任何人都可以帮助我如何 stub @user.solutions.new(params[:id]) ?

Answer 1

看起来我找到了我自己的答案，但我要把它贴在这里，因为我似乎无法在网上找到很多关于这个的信息。

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

这使得 stub 方法很容易，例如:

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

通过做这个:

@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，请随时对此发表评论，我会尽力使其完全正确。

乔