Spec:

require 'spec_helper'

describe CameraReport do

  let(:call_sheet) { create(:call_sheet) }
  let(:camera_report) { create(:camera_report, call_sheet: call_sheet) }
  subject { camera_report }

  describe "associations" do
    it { should belong_to(:call_sheet) }
    it { should have_many(:camera_logs).dependent(:destroy) }
  end

  describe "validations" do
    it { should_not allow_mass_assignment_of(:call_sheet_id) }
    it { should validate_presence_of(:date) }
  end

end

Factory:

FactoryGirl.define do
  factory :call_sheet do
    company_name "company"
    association :draft
    association :stage
    association :category
  end

  factory :camera_report do
    shoot_day 1
    association :call_sheet
  end
end

这个测试 花费了 20 多秒，如果把 call_sheet 换成 let(:call_sheet) { build_stubbed(:call_sheet) } 数据库会报错，因为有 foreign_key call_sheet_id

如果数据库中没有 foreign_key，就可以把 call_sheet 用 stubbed 代替，测试时间大概 0.x 秒

问题是 我应该保留数据库中的 foreign_key 么？还是我测试的写法有问题？怎样做可以使测试不至于如此慢？