Rspec错误。（无法找到询问）

Question

以下是spec / controllers / askings_controller_spec.rb。

   require 'rails_helper'

    RSpec.describe AskingsController, type: :controller do
     describe 'Get #show' do
      before do 
          @asking=create(:asking)
          get :show , id: @asking.id
      end
      it 'should render show' do
          expect(response).to render_template(:show)
      end
      it 'should Undertaking new' do
          expect(assigns(:undertaking)).to be_a_new(Undertaking)
      end
      it 'should response status 200' do
          expect(response.status).to eq(200)
      end
     end
    end

rspec结果如下。

     1) AskingsController Get #show should render show
       Failure/Error: @asking=Asking.find(id: params[:id]) 
       ActiveRecord::RecordNotFound:
       Couldn't find Asking with 'id'={:id=>"2"}
    2) AskingsController Get #show should Undertaking new
       Failure/Error: @asking=Asking.find(id: params[:id])     
       ActiveRecord::RecordNotFound:
       Couldn't find Asking with 'id'={:id=>"2"}
   3) AskingsController Get #show should response status 200
      Failure/Error: @asking=create(:asking)    
      ActiveRecord::RecordInvalid:
      mailaddress exists.(<- I translate Japanese error.)

为什么我有这个神？ 我认为如何使用'创建'是不正确的。 请告诉我解决方案。