使用factory_girl时重复的记录

Question

我在使用rspec + factory-girl时遇到了一些困难。刚开始，这是我的代码示例：

工厂/ users.rb的

require 'faker'

FactoryGirl.define do
  factory :user do |f|
    f.email { Faker::Internet.email }
    f.password "SamplePassword"
  end
end

工厂/ favourites.rb

FactoryGirl.define do
  factory :favourite do
    # `ex_products` table is an external sqlserver table 
    # and it can't be tested with factories cause 
    # there is just one production instance of it.
    ex_product_id 50136

    user
  end
end

规格/模型/ favourite_spec.rb

require 'spec_helper'

describe Favourite do
  subject(:favourite) { FactoryGirl.build(:favourite) }

  it { expect(favourite).to be_valid }

  it "is invalid without a user" do
    favourite.user = nil
    expect(favourite).to be_invalid 
  end

  it "is invalid without a product" do
    favourite.ex_product = nil
    expect(favourite).to be_invalid
  end

  describe "#toggle_for_user" do
    context "when product is faved" do
      before(:all) do
        FactoryGirl.create(:favourite)
      end

      it "removes it from favourites" do
        product = favourite.ex_product
        user    = favourite.user
        Favourite.toggle_for_user(product, user)
        expect(Favourite.all).to be_nil
      end
    end

    context "when product is not faved" do
      it "adds it to favourites"
    end
  end
end

---

现在，问题是：当我测试#toggle_for_user / "removes it from favourites"部分时，我的测试数据库中有两条User条记录，这导致我的测试因用户模型验证和未提及的关系而失败这里。但是，它们并不重要，我唯一需要知道的是为什么在User阶段的数据库中有两个removes it from favourites记录，我该怎么办呢。我在factory_girl docs中找不到任何相关内容。

我用来运行此测试的命令是：

  

rspec spec / models / favourite_spec.rb

所以这是唯一的测试。

提前感谢任何线索！

Answer 1

subject(:favourite) { FactoryGirl.build(:favourite) }

此行构建并保存User实例和构建，但默认情况下不保存Favorite对象。检查“关联”标题下方的the docs。猜猜strategy: :build可以帮助您。