ruby-on-rails - rspec工厂女孩协会

Question

在测试属于作者的书籍列表时，我收到以下错误。

Failure/Error: visit books_path
     ActionView::Template::Error:
       undefined method `name' for nil:NilClass
     # ./app/views/books/_book.html.erb:5:in `_app_views_books__book_html_erb___3197212671375452820_30961180'
     # ./app/views/books/index.html.erb:8:in `_app_views_books_index_html_erb__3030997400964951224_38341240'
     # ./spec/requests/book_pages_spec.rb:13:in `block (3 levels) in <top (required)>'

我已经尝试调试它两天了，但没有成功，现在我向 SO 寻求帮助。

我必须指出 Book#index 正确显示所有书籍，该错误可能只是在我的测试中。我认为工厂女孩没有正确创建关联，因为 book.author 返回 nil。

谢谢!

书.rb

class Book < ActiveRecord::Base
  attr_accessible :title
  belongs_to :author    
  validates :author_id, presence: true
end

作者.rb

class Author < ActiveRecord::Base
  attr_accessible :name
  has_many :books, dependent: :destroy
end

工厂.rb

FactoryGirl.define do
  factory :author do
    sequence(:name) { |n| "Author #{n}" }
  end

  factory :book do
    sequence(:title) { |n| "Lorem ipsum #{n}" }
    author
  end
end

_book.html.erb

<li>
  <span class="title"><%= link_to book.title, book_path(book) %></span>
    <span class="author"><%= link_to book.author.name, author_path(book.author) %></span>
</li>

book_pages_spec.rb

require 'spec_helper'
describe "Book pages" do
  subject { page }
  describe "index" do
    let(:author) { FactoryGirl.create(:author) }
    before(:each) do
      visit books_path
    end
    before(:all) { 32.times {FactoryGirl.create(:book, author: author)} }
    after(:all) { Author.delete_all }
    it { should have_title_and_heading("All books") }
  end
end

Answer 1

在 after(:all) 步骤中，您将清除作者，但不会清除在 before(:all) 步骤中创建的图书。由于 before/after :all Hook 在测试中的任何事务之外运行，因此您的测试数据库中很可能会留下过时的数据。