FactoryBot-创建嵌套对象

我正在学习如何在Rails中进行测试,我正在为我的问题模型编写一个工厂:

require 'factory_bot'

FactoryBot.define do
  factory :question do
    sequence(:content) { |n| "question#{n}" }
    source "BBC"
    year "1999"
  end
end 

问题是我有一个 has_many :choices 关系,我的问题应该有5个选择。所以我想知道如何在工厂机器人上做到这一点。不要从文档中得到,所以希望能得到帮助。谢谢!

以下是我的问题模型:

class Question < ApplicationRecord

  belongs_to :question_status
  belongs_to :user
  has_many :choices

    accepts_nested_attributes_for :choices, limit: 5

  validates :content, :source, :year, presence: true
  validate :check_number_of_choices,


  def check_number_of_choices
    if self.choices.size != 5
        self.errors.add :choices, I18n.t("errors.messages.number_of_choices")
    end
  end

end

我的选择模型:

class Choice < ApplicationRecord

  belongs_to :question

  validates :content, presence: true, allow_blank: false


end

我的工厂代码:

FactoryBot.define do

    factory :question_status do
        name "Pending"
    end

  factory :choice do
    sequence(:content) { |n| "choice #{n}" }
    question
  end


  factory :question do
    sequence(:content) { |n| "question #{n}" }
    source "BBC"
    year "1999"
    user
    question_status

        before :create do |question|
        create_list :choice, 5, question: question
    end

  end

end 

以及我的特性测试(它仍然不起作用,但由于我的验证,它已经不能创建问题了):

require 'rails_helper'

RSpec.feature "Evaluating Questions" do

    before do
        puts "before"
        @john = FactoryBot.create(:user)
        login_as(@john, :scope => :user)
        @questions = FactoryBot.create_list(:question, 5)
        visit questions_path
    end


    scenario "A user evaluates a question correctly" do
        puts "scenario"
    end


end