Rails 4脚手架生成器测试控制器动作更新失败答案

【问题标题】：Rails 4 scaffold generator Testing controller action update failsRails 4脚手架生成器测试控制器动作更新失败
【发布时间】：2014-08-30 19:17:31
【问题描述】：

我正在使用 ruby "2.0.0" and 'rails', '~> 4.0.0' and 'rspec-rails', "2.14.2" (引自 Gemfile。我有两个完全不同的应用程序，我两者都出现相同的错误。

我为我的控制器使用了脚手架生成器。所以它也生成了我的控制器测试。特别是更新操作立即中断。测试代码

  describe "PUT update" do
describe "with valid params" do
  it "updates the requested product" do
    product = Product.create! valid_attributes
    # Assuming there are no other products in the database, this
    # specifies that the Product created on the previous line
    # receives the :update_attributes message with whatever params are
    # submitted in the request.
    expect_any_instance_of(Product).to receive(:update).with({ "product_name" => "Product 1" })
    put :update, {:id => product.to_param, :product => { "product_name" => "Product 1" }}, valid_session
  end

控制器代码：

 # PATCH/PUT /products/1

#PATCH/PUT /products/1.json

定义更新 respond_to 做 |格式| 如果@product.update_attributes(product_params) format.html { redirect_to @product, notice: '产品更新成功。' } format.json { 头 :no_content } 别的 format.html { 渲染动作：“编辑” } format.json { 渲染 json：@product.errors，状态：：unprocessable_entity } 结尾结尾结束

所以我运行我的测试并且：

  1) ProductsController PUT update with valid params updates the requested product
 Failure/Error: Unable to find matching line from backtrace
   Exactly one instance should have received the following message(s) but didn't: update
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-mocks-3.0.2/lib/rspec/mocks/any_instance/recorder.rb:92:in `verify'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-mocks-3.0.2/lib/rspec/mocks/space.rb:69:in `block in verify_all'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-mocks-3.0.2/lib/rspec/mocks/space.rb:69:in `each_value'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-mocks-3.0.2/lib/rspec/mocks/space.rb:69:in `verify_all'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-mocks-3.0.2/lib/rspec/mocks.rb:45:in `verify'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/mocking_adapters/rspec.rb:21:in `verify_mocks_for_rspec'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:354:in `verify_mocks'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:345:in `run_after_example'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:163:in `block in run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `call'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `block (2 levels) in <class:Procsy>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-rails-3.0.1/lib/rspec/rails/example/controller_example_group.rb:174:in `block (2 levels) in <module:ControllerExampleGroup>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:294:in `instance_exec'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:294:in `instance_exec'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/hooks.rb:430:in `block (2 levels) in run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `call'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `block (2 levels) in <class:Procsy>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-rails-3.0.1/lib/rspec/rails/adapters.rb:68:in `block (2 levels) in <module:MinitestLifecycleAdapter>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:294:in `instance_exec'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:294:in `instance_exec'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/hooks.rb:430:in `block (2 levels) in run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `call'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:210:in `block (2 levels) in <class:Procsy>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/hooks.rb:432:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/hooks.rb:485:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:303:in `with_around_example_hooks'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example.rb:145:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:494:in `block in run_examples'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:490:in `map'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:490:in `run_examples'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:457:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `block in run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `map'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `block in run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `map'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/example_group.rb:458:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:112:in `block (2 levels) in run_specs'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:112:in `map'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:112:in `block in run_specs'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/reporter.rb:54:in `report'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:108:in `run_specs'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:86:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:70:in `run'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/lib/rspec/core/runner.rb:38:in `invoke'
 # /Users//.rvm/gems/ruby-2.0.0-p353/gems/rspec-core-3.0.2/exe/rspec:4:in `<top (required)>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/bin/rspec:23:in `load'
 # /Users//.rvm/gems/ruby-2.0.0-p353/bin/rspec:23:in `<main>'
 # /Users//.rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `eval'
 # /Users//.rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `<main>'
 # 
 #   Showing full backtrace because every line was filtered out.
 #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
 #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

在 0.27911 秒内完成（文件加载需要 1.85 秒） 16 个例子，1 个失败

失败的例子：

rspec ./spec/controllers/products_controller_spec.rb:90 # ProductsController PUT update with valid params 更新请求的产品

我在此之后发布响应，问题已解决：

【问题讨论】：

所以一个好朋友看了我的代码，他指出：expect_any_instance_of(Product).to receive(:update).with({ "product_name" => "Product 1" })因此，修复包括在测试中添加 :update_attributes 以调用模型，而不是像以前那样作为控制器操作。所以：expect_any_instance_of(Product).to receive(:update_attributes).with({ "product_name" => "Product 1" }) 现在测试通过了。我希望这有帮助。我对 Rails 还很陌生，所以请容忍任何准确性或错误。随时报告错别字或更正。谢谢大家。

标签： ruby ruby-on-rails-4 rspec controller

【解决方案1】：

所以一个好朋友看了我的代码，他指出：

expect_any_instance_of(Product).to receive(:update).with({ "product_name" => "Product 1" })

正在尝试从模型接收更新。模型上没有更新方法：

    class Product < ActiveRecord::Base
  before_validation :normalize_name, on: :create
  validates :product_name, presence: true, uniqueness: true
  validates :product_cost, presence: true, :numericality => { :greater_than_or_equal_to => 1 }

  protected
    def normalize_name
      self.product_name = self.product_name.downcase.titleize
    end
end

因此修复包括将 :update_attributes 添加到测试中，以便调用模型，而不是像以前那样作为控制器操作。

        expect_any_instance_of(Product).to receive(:update_attributes).with({ "product_name" => "Product 1" })

现在测试通过了。

我希望这会有所帮助。我对 Rails 很陌生，所以请容忍任何不准确或错误。随时报告错别字或更正，他们总是受欢迎的。

【讨论】：