FactoryBot-创建嵌套对象 [英] FactoryBot - create nested objects

问题描述

我正在学习如何在Rails中进行测试，并且正在为我的问题模型编写工厂：

I'm learning how to test in rails and I'm writing a factory for my question model:

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，对于这个问题，我应该有5个选择。所以我想知道如何在工厂机器人上做到这一点。请不要从文档中获取该信息，不胜感激。谢谢！

The problem is that I have a has_many :choices relationship, where I should have 5 choices for my question. So I would like to know how to do that on factory bot. Don't got it from the documentation so would appreciate any help. Thanks!

这是我的问题模型：

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 

我的功能测试（它仍然不执行任何操作，但是由于我的验证，它已经无法创建问题）：

And my feature test (it still does nothing, but it already fails just to create the questions because of my validation):

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

推荐答案

可能会发生什么此处使用 select 和 choices 集合代理使Rails尝试从数据库加载集合再次在验证，但尚未持久化。尝试从验证中删除 select

What's possibly going on here is the use of select with the choices collection proxy is causing Rails to attempt to load the collection from the DB again during the validation but they haven't been persisted yet. Try removing the select from your validation

if self.choices.size != 5

select 可能是'确实确实需要，因为 Choice 模型已经验证了内容是否存在。在构建列表时，您可能还需要为问题分配选项

The select probably isn't really needed anyway since the Choice model already verifies that content has to be present. You'll probably also need to assign the choices to the question when you build the list

before :create do |question|
  question.choices = build_list :choice, 5, question: question
end

这篇关于FactoryBot-创建嵌套对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！