问RSpec错误用户必须与FactoryGirl一起存在

EN

class Composition < ActiveRecord::Base
  belongs_to :user
  belongs_to :group

  validates :name, presence: true, uniqueness: {scope: :user_id}

end

require 'faker'

FactoryGirl.define do
  factory :composition do
    name { Faker::Name.name }
    description { Faker::Lorem.words }
    import_composition { Faker::Boolean.boolean }
    import_composition_file { Faker::File.file_name('path/to') }
  end
end

require 'rails_helper'

  describe CompositionsController do

    before(:each) do
       @user = FactoryGirl.create(:user)
       @group = FactoryGirl.create(:group)
       sign_in @user
       @composition = Composition.new(FactoryGirl.create(:composition), user_id: @user.id, group_id: @group.id)
    end

  describe "GET #index" do
    it "renders the index template" do
      get :index

      expect(assigns(:composition).to eq(@composition))
      expect(response).to render_template("index")
    end
  end

end