嵌套资源的"should get show"控制器测试失败

Question

我有User模型和Shoppingcart模型，其中

# user.rb
class User < ActiveRecord::Base
    has_one :shoppingcart
end

和

# shopppingcart.rb
class Shoppingcart < ActiveRecord::Base
    belongs_to :user
end

我在路线上有这个。rb:

resources :users do
    resource :shoppingcart
end

在Shoppingcarts_controller.rb我有

class ShoppingcartsController < ApplicationController
    def show
        @user = User.find(current_user)
        @shoppingcart = @user.build_shoppingcart
    end
end

以及在shoppingcarts_controller_test.rb:内

require 'test_helper'
class ShoppingcartsControllerTest < ActionController::TestCase
    def setup
        @user = users(:michael)
    end
    test "should get show" do
        puts(@user.name) # => Michael Example
        puts(@user.id) # => 762146111
        get :show # error line
        assert_response :success
    end
end

但当我运行测试时，我会得到ActiveRecord::RecordNotFound: Couldn't find User with 'id'=。当我注释掉错误行时，错误就会消失，一切正常。至于非测试代码，一切正常。我可以毫无问题地到达users/1/shoppingcart，所以问题一定来自测试本身。如何对嵌套资源的操作进行测试？

SessionsHelper.rb:

module SessionsHelper
    # Returns the current logged-in user (if any).
    def current_user
        if (user_id = session[:user_id])
            @current_user ||= User.find_by(id: user_id)
        elsif (user_id = cookies.signed[:user_id])
            user = User.find_by(id: user_id)
            if user && user.authenticated?(:remember, cookies[:remember_token])
                log_in user
                @current_user = user
            end
        end
    end
end 

Answer 1

find方法需要Users表中特定用户的主键，而不是用户本身。主键是id，所以您需要更改控制器中的这一行。

@user = User.find(params[:user_id])