Rspec 和 Foreign Key 的问题

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

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