Ruby on Rails教程第10章练习RSpec故障

Question

我正在做Rails教程第10章中的练习，但我在练习中遇到了一个问题，那就是我要确保管理员用户不能删除自己。我最初的想法是简单地检查当前用户的id，并将其与params:id进行比较，以确保它们不相等。我在用户控制器中的销毁操作如下所示：

def destroy
  if current_user.id == params[:id].to_i
    flash[:notice] = "You cannot delete yourself."
  else
    User.find(params[:id]).destroy
    flash[:success] = "User destroyed."
  end
  redirect_to users_path
end

当我在应用程序中手动测试它时，这种方法工作得很好，但我的三次RSpec测试都失败了，出现了同样的“未定义的方法'to_i'”错误(如下所示)：

1) UsersController DELETE 'destroy' as an admin user should destory the user
   Failure/Error: delete :destroy, :id => @user
     NoMethodError:
       undefined method `to_i' for #<User:0x000001032de188>
   # ./app/controllers/users_controller.rb:48:in `destroy'
   # ./spec/controllers/users_controller_spec.rb:310:in `block (5 levels) in <top (required)>'
   # ./spec/controllers/users_controller_spec.rb:309:in `block (4 levels) in <top (required)>'

2) UsersController DELETE 'destroy' as an admin user should redirect to the users page
   Failure/Error: delete :destroy, :id => @user
     NoMethodError:
       undefined method `to_i' for #<User:0x000001032b5850>
   # ./app/controllers/users_controller.rb:48:in `destroy'
   # ./spec/controllers/users_controller_spec.rb:315:in `block (4 levels) in <top (required)>'

3) UsersController DELETE 'destroy' as an admin user should not allow you to destroy self
   Failure/Error: delete :destroy, :id => @admin
     NoMethodError:
       undefined method `to_i' for #<User:0x0000010327e350>
   # ./app/controllers/users_controller.rb:48:in `destroy'
   # ./spec/controllers/users_controller_spec.rb:321:in `block (5 levels) in <top (required)>'
   # ./spec/controllers/users_controller_spec.rb:320:in `block (4 levels) in <top (required)>'

如果我使用params:id来查找用户，并将其与下面的current_user进行比较，那么它在应用程序和RSpec中都可以工作。

def destroy
  if current_user == User.find(params[:id])
    flash[:notice] = "You cannot delete yourself."
  else
    User.find(params[:id]).destroy
    flash[:success] = "User destroyed."
  end
  redirect_to users_path
end

为什么RSpec中的"to_i“方法会有问题？如果有人想知道我倾向于这种方法，因为我认为最好简单地将当前用户id与要删除的用户的id进行比较(通过params:id)，而不是点击db来“找到”该用户。

作为参考，下面是我的RSpec测试：

  describe "DELETE 'destroy'" do
    before(:each) do
        @user = Factory(:user)
    end 

    ...

    describe "as an admin user" do
      before(:each) do
        @admin = Factory(:user, :email => "admin@example.com", :admin => true)
        test_sign_in(@admin)
      end

      it "should destory the user" do
        lambda do
          delete :destroy, :id => @user
        end.should change(User, :count).by(-1)
      end

      it "should redirect to the users page" do
        delete :destroy, :id => @user
        response.should redirect_to(users_path)
      end

      it "should not allow you to destroy self" do
        lambda do
          delete :destroy, :id => @admin
        end.should change(User, :count).by(0)
        response.should redirect_to(users_path)
        flash[:notice].should =~ /cannot delete yourself/
      end
    end
  end

任何帮助都将不胜感激！

Answer 1

在你的规范中，尝试在你的:id参数上使用@user.id而不是@user (我知道教程说只使用@user，但可能有一些id没有被正确提取的地方)：

delete :destroy, :id => @user.id

但您可以考虑将结构调整为如下所示：

@user = User.find(params[:id])
if current_user == @user
  flash[:notice] = "You cannot delete yourself."
else
  @user.destroy
  flash[:success] = "User destroyed."
end