在控制器中创建 rspec 错误

Question

这是 rspec 中的错误：

CategoriesController GET 'update' should be successful
 Failure/Error: get 'update'
 ActiveRecord::RecordNotFound:
   Couldn't find Category without an ID
 # c:in `find'
 # ./app/controllers/categories_controller.rb:45:in `update'
 # ./spec/controllers/categories_controller_spec.rb:35:in `block (3 levels) in <top (required)>'

这是控制器中的代码：

  def edit
    @category = Category.find(params[:id])
  end

  def update
    @category = Category.find(params[:id])
    #@category.reload. caused nil.reload error

    if @category.update_attributes(params[:category], :as => :roles_update)  
      @category = Category.find(params[:id])
      redirect_to @category, :notice => 'Category was successfully updated'
    else
      @categories = Category.all
      render 'index'
    end 
  end

这是 rspec 代码：

  describe "GET 'update'" do
    it "should be successful" do
      get 'update'
      response.should be_success
    end
  end

有什么想法吗？谢谢。

Answer 1

您粘贴了创建操作而不是更新操作。此外，您正在尝试使用 get 请求测试更新操作。如果您遵循约定，它应该使用 put 请求。

如果你已经实现了更新操作......你会或多或少地测试：

describe CategoriesController do
  let(:category) { mock_model(Category).as_null_object }

  describe "PUT update" do
    before do
      Category.should_receive(:find).with(5).and_return(category)
    end

    context "when a category updates succesfully" do
      before do
        category.stub(:update_attributes).and_return(true)
      end

      it "redirects to the categories page" do
        put :update, :id => 5, :category => { :some_val => 4 }
        response.should redirect_to(categories_path)
      end

      it "sets the flash message" do
        put :update, :id => 5, :category => { :some_val => 4 }
        flash[:notice].should eq("Category was succesfully updated")
      end
    end

    context "when a category does not update successfully" do
      before do
        category.stub(:update_attributes).and_return(false)
      end

      it "sets the flash message"
      it "redirects to the categories page"

      # etc etc
    end
  end
end

要达到这一点（意味着添加模拟模型、存根，你有什么），你通常会开始“新鲜”，可以这么说，并按照 TDD 风格工作。希望对你有帮助