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我想运行一些 RSpec 测试来测试 Rails 中的 Ancestry。我想使用 FactoryGirl 为测试创建机构实例。我尝试了下面提到的以下方法，但没有成功创建子记录。

工厂.rb文件

  factory :institution do
    # sequence(:name) { |n| "University of XYZ#{n}" }
  end

在测试中，我使用以下样式 样式：1

let(:institution){ FactoryGirl.create(:institution, name: "ABC Institution") }
let(:institution_child) {FactoryGirl.create(:institution, name: "Sub Institution", ancestry: institution.id) }

款式：2

let(:institution){ FactoryGirl.create(:institution, name: "ABC Institution") }
let(:institution_child) {FactoryGirl.create(:institution, name: "Sub Institution", parent_id: institution.id) }

款式：3

describe Institution do
  before do
    @institution = Institution.create({:institution, name: "ABC Institution"})
    @institution_child = Institution.create(:institution, name: "Sub Institution"}
  end

  it "should create the child institution" do
    assigns(:institution_child).should be_a_new(Institution) …