Question

我对rails很新。我试图通过两个表执行者和性能之间的关系创建一个简单的has_many。我甚至无法通过基本的rspec测试。我不知道我做错了什么

这是我得到的错误

  1) Performers to Performances relationship
     Failure/Error: let(:relationship) { performer.performer_performances.build(
performance_id: performance.id) }
     NameError:
       uninitialized constant Performer::PerformerPerformance
     # ./spec/models/performer_performance_spec.rb:12:in `block (2 levels) in <t
op (required)>'
     # ./spec/models/performer_performance_spec.rb:14:in `block (2 levels) in <t
op (required)>'
     # ./spec/models/performer_performance_spec.rb:15:in `block (2 levels) in <t
op (required)>'

这里是我的rspec文件（我现在把方法改为更简洁的测试方法，但是你可以看到我想通过但我已经评论过了）

\规格\模型\ performer_performance_spec.rb

    require 'spec_helper'

describe "Performers to Performances relationship" do


   let(:performer) { FactoryGirl.create(:performer) }
   let(:performance) { FactoryGirl.create(:performance) }
   let(:relationship) { performer.performer_performances.build(performance_id: performance.id) }

   subject { relationship }
   it { should be_valid }
    #before do 
    #  @example_performer   = FactoryGirl.create(:performer)
    #  @example_performance = FactoryGirl.create(:performance)
    #end

    it "should recognise when a performer has no performances" do
     # @example_performer.performances.count.should == 0
    end
    it "should handle a performer with a performance" do
     # @example_performer.performances << @example_performance
     # @example_performer.performances.count.should == 1
    end

   it "should automatically know a performance's performer" do
     # @example_performer.performances << @example_performance
     # @example_performance.performers.count.should == 1
   end
   it "should not allow the same artist twice in a performance" do
      # @example_performance.performers << @example_performer
      # @example_performance.performers << @example_performer
      # @example_performance.performers.count.should == 1
   end
end

这是我的文件

\应用\模型\ performance.rb

   class Performance < ActiveRecord::Base
   validates :file_name, presence: true, length: { maximum: 50 },  uniqueness: { case_sensitive: false }
   validates :date, length: { maximum: 30 }  
   validates :location, length: { maximum: 50 }
   has_many :performer_performances, dependent: :destroy  
   has_many :performers, through: :performer_performances
end

\应用\模型\ performer.rb

class Performer < ActiveRecord::Base
   validates :name, presence: true, length: { maximum: 50 },  uniqueness: { case_sensitive: false }
   has_many :performer_performances, dependent: :destroy  
   has_many :preformances, through: :performer_performances
end

\分贝\迁移\ 20140315155732_create_performer_performance.rb

class CreatePerformerPerformance < ActiveRecord::Migration
  def change
    create_table :performer_performances do |t|
      t.belongs_to :performer
      t.belongs_to :performance
      t.timestamps
    end
  end
    add_index :performer_performances, :performer_id
    add_index :performer_performances, :performance_id
    add_index :performer_performances, [:performer_id, :performance_id], unique: true
end

\规格\ factories.rb

FactoryGirl.define do

  sequence :name do |n|
    "slimshady#{n}"
  end

  factory :performer do
       name :name    
  end
  factory :performance do
    file_name     :name
    date          Date.new(2008, 12, 22)
    location      "lame house" 
  end

end

我运行bundle exec rake db:migrate和test:prepare

以防我的Gemfile

source 'https://rubygems.org'
ruby '2.0.0'
#ruby-gemset=railstutorial_rails_4_0

gem 'rails', '4.0.3'
gem 'bootstrap-sass', '2.3.2.0'
gem 'bcrypt-ruby', '3.1.2'
gem 'faker', '1.1.2'  #ch9.29

gem 'will_paginate', '3.0.4' #ch9.3 
gem 'bootstrap-will_paginate', '0.0.9'

group :development :test do
  gem 'sqlite3', '1.3.8'
  gem 'rspec-rails', '2.13.1'
end

group :test do
  gem 'selenium-webdriver', '2.35.1'
  gem 'capybara', '2.1.0'
  gem 'factory_girl_rails', '4.2.1'
end

gem 'sass-rails', '~> 4.0.0'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.1'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'

group :doc do
  gem 'sdoc', '0.3.20', require: false
end

group :production do
  gem 'pg', '0.15.1'
  gem 'rails_12factor', '0.0.2'
end

我没有找到任何拼写错误，所以我更新了这个。我正在运行windows vista x64，如果这改变了什么......

Answer 1

由于您没有显示该文件，我假设您尚未在performer_performance.rb中创建app/models文件。迁移负责创建数据库表，但您仍需要通过使用适当的类定义创建主题文件来创建ActiveRecord模型。

您得到的错误是因为Ruby / Rails遇到常量引用（即PerformerPerformance）并且找不到具有相应定义的相应文件。

通过关系创建has_many并使用rspec进行测试

1 个答案: