FactoryGirl、Paperclip、Rspec未定义上传方法

Question

我从 github 关注了这个 repo，rails-multimodel-upload-demo，了解如何使用回形针和 rails 进行多次上传。我目前正在尝试使我的规格通过，但 atm 有四个错误。

Failures:

  1) Cars Cars#show page navigation is the car details nav 
     Failure/Error: before { visit car_path(car) }
     ActionView::Template::Error:
       undefined method `upload' for nil:NilClass
     # ./app/views/cars/show.html.haml:77:in `block in _app_views_cars_show_html_haml___4520108654775620781_2201394220'
     # ./app/views/cars/show.html.haml:71:in `each'
     # ./app/views/cars/show.html.haml:71:in `_app_views_cars_show_html_haml___4520108654775620781_2201394220'
     # ./spec/requests/cars_spec.rb:19:in `block (3 levels) in <top (required)>'

  2) Cars Cars#show page navigation is the car details nav 
     Failure/Error: before { visit car_path(car) }
     ActionView::Template::Error:
       undefined method `upload' for nil:NilClass
     # ./app/views/cars/show.html.haml:77:in `block in _app_views_cars_show_html_haml___4520108654775620781_2201394220'
     # ./app/views/cars/show.html.haml:71:in `each'
     # ./app/views/cars/show.html.haml:71:in `_app_views_cars_show_html_haml___4520108654775620781_2201394220'
     # ./spec/requests/cars_spec.rb:19:in `block (3 levels) in <top (required)>'

  3) Cars /inventory navigation is the normal main nav 
     Failure/Error: before { visit inventory_path }
     ActionView::Template::Error:
       undefined method `upload' for nil:NilClass
     # ./app/views/cars/index.html.haml:22:in `block in _app_views_cars_index_html_haml___2242562919032452782_2174180500'
     # ./app/views/cars/index.html.haml:16:in `_app_views_cars_index_html_haml___2242562919032452782_2174180500'
     # ./spec/requests/cars_spec.rb:5:in `block (3 levels) in <top (required)>'

  4) Cars /inventory navigation is the normal main nav 
     Failure/Error: before { visit inventory_path }
     ActionView::Template::Error:
       undefined method `upload' for nil:NilClass
     # ./app/views/cars/index.html.haml:22:in `block in _app_views_cars_index_html_haml___2242562919032452782_2174180500'
     # ./app/views/cars/index.html.haml:16:in `_app_views_cars_index_html_haml___2242562919032452782_2174180500'
     # ./spec/requests/cars_spec.rb:5:in `block (3 levels) in <top (required)>'

Finished in 3.58 seconds
132 examples, 4 failures

cars_spec.rb

require 'spec_helper'                                    

describe "Cars" do                                       
  describe "/inventory" do                               
    before { visit inventory_path }                      
    subject { page }                                     

    describe "navigation" do                             
      describe "is the normal main nav" do               
        it { should have_selector("#main-nav") }         
        it { should_not have_selector("#car-nav") }      
      end                                                
    end                                                  
  end                                                    

  describe "Cars#show page" do                           
    let(:car) { FactoryGirl.create(:car) }               
    before { visit car_path(car) }                       
    subject { page }                                     

    describe "navigation" do                             
      describe "is the car details nav" do               
        it { should have_selector("#car-nav") }          
        it { should_not have_selector("#main-nav") }     
      end                                                
    end                                                  
  end                                                    
end 

show.html.haml

%section#enquire                                         
  = link_to contact_path(subject: "Enquiry: #{@car.year}\
 #{@car.make} #{@car.model}", anchor: 'send-us-a-message\
'), class: 'button' do                                   
    Enquire                                              
    %br                                                  
    %span                                                
      for more details                                   
%section#view-more                                       
  .row                                                   
    .small-12.small-centered.columns                     
      %h1                                                
        View More                                        
      %ul.small-block-grid-1.medium-block-grid-3         
        - @cars.each do |car|                            
          %li                                            
            %p                                           
              = car.year                                 
              = car.make                                 
              = car.model                                
            = link_to image_tag(car.uploads.first.upload.url), car     

在这里你可以看到car.uploads.first.upload.url，所以我认为这是发生错误的地方。

我尝试关注How Do I Use Factory Girl To Generate A Paperclip Attachment?，但没有成功。然而，模型与问题相似。

错误提到有一个 nil 类，因此工厂没有进行上传。即使按照前面的“问题”的答案，我也没有得到它的工作。

cars_controller.rb

  def show                                               
    @cars = Car.without_car(@car).shuffle[0...3]         
    @previous = @car.id == 1 ? Car.last : Car.find( @car\
.id - 1 )                                                
    @next = @car == Car.last ? Car.first : Car.find( @ca\
r.id + 1 )                                               
    @uploads = @car.uploads                              
    @bodyid = 'car-details'                              
  end  

对我的工厂进行一些更改后

include ActionDispatch::TestProcess                                                                                 

FactoryGirl.define do                                                                                               
  factory :car do                                                                                                   
    make "MyString"                                                                                                 
    model "MyString"                                                                                                
    year 1                                                                                                          
    seats 1                                                                                                         
    transmission "MyString"                                                                                         
    drive "MyString"                                                                                                
    interior "MyString"                                                                                             
    exterior "MyString"                                                                                             
    uploads { fixture_file_upload(Rails.root.join('spec', 'photos', 'test.jpg'), 'image/jpg') }                     
  end                                                                                                               
end  

我得到更多错误

Failure/Error: let(:car) { FactoryGirl.create(:car) }
     ActiveRecord::AssociationTypeMismatch:
       Upload(#2223442800) expected, got String(#2164378420)

通过阅读ActiveRecord::AssociationTypeMismatch，该对象被传递到汽车变量中。 Ruby/Rails/Rspec - ActiveRecord::AssociationTypeMismatch:我不确定这到底是什么关系，但我正在调查。

Answer 1

当我之前失败的规范通过时，我正在开发上一个和下一个链接功能。这是解决它的答案RSpec and Factory for testing next, prev records

未定义upload 的原因是let(:user) 实际上并没有为:user 写入记录。一旦我添加了let!(:user) { FactoryGirl.create(:user) }，一切正常