Factory Girl 自连接抛出验证错误

Question

我正在尝试测试一个用于创建文章翻译的系统，其中在出版物上有一个自连接 table。我创建了一个工厂，它将创建多个翻译并将它们与 'parent' 文章相关联。

将 Rails 5 与 factory_girl 4.7.0、rspec 和 Database_cleaner

一起使用

所有操作都按预期工作，但问题在于创建测试

这里是相关的模型验证和方法：

  # models/publication.rb

  has_many :translations, class_name: "Publication", foreign_key: "translation_id", dependent: :nullify
  belongs_to :translation, class_name: "Publication", optional: true

  validates :language, uniqueness: { scope: :translation_id }, if: :is_translation?

  def is_translation?
    !translation.nil?
  end

工厂（省略无关代码）：

  # spec/factories/publication.rb
  factory :publication, aliases: [:published_pub] do
    title 'Default Title'
    language 'EN'
    published

    after(:build) do |object|
      create(:version, publication: object)
    end

    #-- This is where I suspect the problem stems from

    trait :with_translations do
      association :user, factory: :random_user

      after(:build) do |object|
        create_list(:translation, 3, {user: object.user, translation:object})
      end
    end
  end

  factory :translation, class: Publication do
    sequence(:title) { |n| ['French Article', 'Spanish Article', 'German Article', 'Chinese Article'][n]}
    sequence(:language) { |n| ['FR', 'ES', 'DE', 'CN'][n]}
    user
  end

还有一个基本测试：

    # spec/models/publication_spec.rb
    before(:each) do
      @translation_parent = create(:publication, :with_translations)
      @pub_without_trans = create(:publication, :with_random_user)
    end

    scenario 'is_translation?' do
      # No actual test code needed, this passes regardless
    end

    scenario 'has_translations?' do
      # No actual test code needed, this (and subsequent tests) fail regardless
    end

最后报错：

 Failure/Error: create_list(:translation, 3, {user: object.user, translation:object})

 ActiveRecord::RecordInvalid:
   Validation failed: Language has already been taken

第一个测试通过（并且正确创建了带有翻译的发布对象）但是任何后续测试都失败了。问题是我有一个范围为 translation_id 的唯一性验证，而且 factorygirl 似乎正在尝试将生成的翻译添加到已经存在的出版物中，而不是创建一个全新的出版物。

感谢任何帮助！

Answer 1

已解决！

问题是 translation 工厂中的序列迭代器在每次测试后都没有重置为 0。所以在测试 1 之后，它开始尝试访问一个不存在的数组索引。再次执行此操作后，它触发了验证并且测试失败了！

解决方案不可爱，但暂时够用了

sequence(:language) do |iteration|
  array = ['FR', 'ES', 'DE', 'CN']
  # Returns a number between 0 and array.length
  array[iteration%array.length]
end
sequence(:title) do |iteration|
  array = ['French Article', 'Spanish Article', 'German Article', 'Chinese Article']
  # Returns a number between 0 and array.length
  array[iteration%array.length]
end

Factory Girl 自连接抛出验证错误

Factory Girl self-join throwing validation errors

testing

rspec

ruby-on-rails

ruby-on-rails-5

factory-bot