當我向will_paginate中添加「order」參數時，Rspec拋出瘋狂錯誤？

Question

我有一個用戶和郵政模型。而我展示在用戶視圖顯示在用戶的帖子：

users_controller.rb：

def show 
    @user = User.find(params[:id]) 

    default_order = "created_at DESC" 
    params[:order_by] ||= default_order 
    @posts = @user.posts.paginate(page: params[:page], 
            per_page: 10, 
            order: params[:order_by]) if signed_in? 
    @posts = @user.posts.paginate(page: params[:page]) 
    end 

用戶/ show.html.erb：

<% if @user.posts.any? %> 
    <h3>Posts (<%= @user.posts.count %>)</h3> 

    <ul class="posts unstyled"> 
    <%= render @posts %> 
    </ul> 
    <%= will_paginate @posts %> 
<% end %> 

的帖子在現場表現很好。但是，當我運行這個規格：

user_pages_spec.rb：

describe "profile page" do 
    let(:user) { FactoryGirl.create(:user) } 
    let!(:p1) { FactoryGirl.create(:post, user: user, title: "Fo", 
            content: "Foo") } 
    let!(:p2) { FactoryGirl.create(:post, user: user, title: "Ba", 
            content: "Bar") } 

    before { visit user_path(user) } 

    it { should have_selector('h1', text: user.name) } 
    it { should have_selector('title', text: user.name) } 

    describe "posts" do 
     it { should have_content(p1.title) } 
     it { should have_content(p1.content) } 
     it { should have_content(p2.title) } 
     it { should have_content(p2.content) } 
     it { should have_content(user.posts.count) } 
    end 
    end 

我得到這個瘋狂的錯誤：

6) User pages profile page posts 
     Failure/Error: it { should have_content(p1.title) } 
     expected there to be content "Fo" in "Action Controller: Exception caught 
      body { background-color: #fff; color: #333; } 
      body, p, ol, ul, td { 
      font-family: helvetica, verdana, arial, sans-serif; 
      font-size: 13px;  
      line-height: 18px; 
      } 
      pre { 
      background-color: #eee;  
      padding: 10px; 
      font-size: 11px; 
      white-space: pre-wrap; 
      }  
      a { color: #000; } 
      a:visited { color: #666; } 
      a:hover { color: #fff; background-color:#000; } 

      ArgumentError in 
      Users#show 



      Showing /home/alex/rails/inkleak/app/views/users/show.html.erb where line #20 raised: 
      'nil' is not an ActiveModel-compatible object that returns a valid partial path. 

      Extracted source (around line #20): 
      17: <h3>Posts (<%= @user.posts.count %>) 

，去，去，去......像千行。

這很奇怪，因爲測試，如果我評論這行工作得很好：

#default_order = "created_at DESC" 
    #params[:order_by] ||= default_order 

    #order: params[:order_by]) 

可能是什麼問題呢？

編輯：

這裏是我的工廠：

factories.rb：

factory :user do 
    sequence(:name) { |n| "Person #{n}" } 
    sequence(:email) { |n| "person_#{n}@example.com"} 
    password "foobar" 
    password_confirmation "foobar" 

    factory :admin do 
     admin true 
    end 
    end 

    factory :post do 
    title "lorem" 
    content "lorem ipsum" 
    #tagging 
    category 
    user 
    after(:build) do |post| 
     post.tags << FactoryGirl.build(:tag) 
    end 
    end 

Answer 1

您正在使用order不正確地will_paginate。

這是你會怎麼做：

@user.posts.paginate(page: params[:page], per_page: 10).order(params[:order_by]) 

Source