行爲的RSpec的讓與FactoryGirl

Question

我試圖用FactoryGirl爲我控制器的規格之一創建幾個項目：

的摘錄：

describe ItemsController do 
    let(:item1){Factory(:item)} 
    let(:item2){Factory(:item)} 

    # This fails. @items is nil because Item.all returned nothing 
    describe "GET index" do 
     it "should assign all items to @items" do 
      get :index 
      assigns(:items).should include(item1, item2) 
     end 
    end 

    # This passes and Item.all returns something 
    describe "GET show" do 
     it "should assign the item with the given id to @item" do 
      get :show, id => item1.id 
      assigns(:item).should == item1 
     end 
    end 
end 

當我改變讓這個：

before(:each) do 
    @item1 = Factory(:item) 
    @item2 = Factory(:item) 
end 

我把@放在變量的前面，一切正常。爲什麼不讓版本讓我們工作？我試着改變讓讓！並看到相同的行爲。

Answer 1

let(:item1) { FactoryGirl.create(:item) } 
let(:item2) { FactoryGirl.create(:item) } 

其實，當你讓（：項目1）它會做延遲加載，在內存中創建對象而不是將其保存在數據庫中，當你做

@item1 = Factory(:item) 

它會創建的對象數據庫。

試試這個：（！：讓）被強制每個方法調用之前評估，如果你不調用它，而

describe ItemsController do 
    let!(:item1){ Factory(:item) } 
    let!(:item2){ Factory(:item) } 

    describe "GET index" do 
     it "should assign all items to @items" do 
      get :index 
      assigns(:items).should include(item1, item2) 
     end 
    end 

    describe "GET show" do 
     it "should assign the item with the given id to @item" do 
      get :show, id => item1.id 
      assigns(:item).should == item1 
     end 
    end 
end 

讓利將永遠不會被實例化。

，或者你可以這樣做：

describe ItemsController do 
    let(:item1){ Factory(:item) } 
    let(:item2){ Factory(:item) } 

    describe "GET index" do 
     it "should assign all items to @items" do 
      item1, item2 
      get :index 
      assigns(:items).should include(item1, item2) 
     end 
    end 

    describe "GET show" do 
     it "should assign the item with the given id to @item" do 
      get :show, id => item1.id 
      assigns(:item).should == item1 
     end 
    end 
end