Question

我运行测试rspec spec / controllers / lost_pets_controller_spec.rb并在线上出现错误获取：show，id：lost_pet ：

require 'rails_helper'

RSpec.describe LostPetsController, type: :controller do
  let(:lost_pet) { create(:lost_pet) }

  describe "Get #Index" do
    let(:lost_pets) { create_list(:lost_pet, 2) }
    before{ get :index }

    it "populates an array of all lost_pets" do
      expect(assigns(:lost_pets)).to match_array(lost_pets)    
    end

    it "renders index view" do
      expect(response).to render_template(:index) 
    end
  end

  describe 'Get #show' do
    before do
      get :show, id: lost_pet
    end

    it 'assings the requested lost pet to @lost_pet' do
      expect(assigns(:lost_pet)).to eq lost_pet
    end

    it 'renders show view' do
      expect(response).to render_template(:show)
    end
  end
end

lostpetscontroller.rb

class LostPetsController < ApplicationController
  before_action :load_lost_pet, only: [:show]

  respond_to :html

  def index
      @lost_pets = LostPet.all
  end

  def show
    @lost_pet
  end


  private

  def load_lost_pet
    @lost_pet = LostPet.find(params(:id))
  end

  def lost_pet_params
    params.require(:lost_pet).permit([:id, :name, :type_pet, :breed, :gender, :size,
      :colour, :age, :age_unit, :description, :collar_description, :desexed, 
      :microchipped, :microchip_number, :date_missing, :rewald, :image, :adress_lost,
      :name_host, :telephone, :email ])
  end

end

登录终端：

LostPetsController Get #show assings the requested lost pet to @lost_pet
     Failure/Error: get :show, id: lost_pet
     ArgumentError:
       wrong number of arguments (1 for 0)
     # /usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_controller/metal/strong_parameters.rb:656:in `params'
     # ./app/controllers/lost_pets_controller.rb:18:in `load_lost_pet'

为什么错误的数字参数为动作显示错误？怎么解决这个问题？感谢提前帮助。

Answer 1

更改行：

@lost_pet = LostPet.find(params(:id))

要：

@lost_pet = LostPet.find(params[:id])

（注意方括号）

Answer 2

错误消息：

 ArgumentError:
   wrong number of arguments (1 for 0)

表示您正在调用方法并提供一个参数，但该方法不接受任何参数，因此“1表示0”。哪种方法？这是回溯中的第一个：

/usr/local/rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_controller/metal/strong_parameters.rb:656:in `params'

params返回参数哈希。您可以在控制器中快速查看错误原因：

@lost_pet = LostPet.find(params(:id))

使用方括号而不是parens来修复它：

@lost_pet = LostPet.find(params[:id])

Rspec：方法get：show，ArgumentError：错误的参数个数（1表示0）

2 个答案: