如何使用 factory_bot 来构建缺乏访问方法的对象？

huangapple
go评论90阅读模式
英文:

How to use factory_bot to build objects that lack accessor methods?

问题

  1. class Person
  2.   attr_reader :name # 但没有 attr_accessor
  3.   def initialize(name)
  4.     @name = name
  5.   end
  6. end
  8. FactoryBot.define do
  9.   factory :person do
  10.     name { 'Grace' }
  11.   end
  12. end

如何使用 factory_bot 创建一个 Person？如果尝试 build :person，会出现以下错误：

  1. NoMethodError .. undefined method `name='

我编写了一个自定义构建策略，它可以工作，但我对它不满意，因为我不得不使用 instance_variable_get 来访问私有库对象。

  1. class BuildNew
  2.   def association(runner)
  3.     runner.run
  4.   end
  6.   # @param evaluation [FactoryBot::Evaluation]
  7.   def result(evaluation)
  8.     attributes = evaluation.hash
  9.     model_class = evaluation.instance_variable_get(:@attribute_assigner).send(:build_class_instance).class
  10.     model_class.new(attributes)
  11.   end
  12. end
  13. FactoryBot.register_strategy(:build_new, BuildNew)
  2. <details>
  3. <summary>英文:</summary>
  5. Given a data model that lacks accessor methods,
  7. ```ruby
  8. class Person
  9.   attr_reader :name # but NO attr_accessor
  10.   def initialize(name)
  11.     @name = name
  12.   end
  13. end
  15. FactoryBot.define do
  16.   factory :person do
  17.     name { &#39;Grace&#39; }
  18.   end
  19. end

How can I use factory_bot to build a Person? If we try build :person we get:

  1. NoMethodError .. undefined method `name=&#39;

I wrote a custom build strategy which works, but I am not pleased with it because I had to use instance_variable_get to access private library objects.

  1. class BuildNew
  2.   def association(runner)
  3.     runner.run
  4.   end
  6.   # @param evaluation [FactoryBot::Evaluation]
  7.   def result(evaluation)
  8.     attributes = evaluation.hash
  9.     model_class = evaluation.instance_variable_get(:@attribute_assigner).send(:build_class_instance).class
  10.     model_class.new(attributes)
  11.   end
  12. end
  13. FactoryBot.register_strategy(:build_new, BuildNew)

答案1

得分: 2

以下是翻译好的部分：

似乎自定义构建策略是不必要的。可以使用 initialize_with 更简单地完成这个任务。

  1. FactoryBot.define do
  2.   factory :person do
  3.     initialize_with { new(attributes) }
  4.     name { 'Grace' }
  5.   end
  6. end
英文:

It seems the custom build strategy was unnecessary. This can be done much more simply using initialize_with.

  1. FactoryBot.define do
  2.   factory :person do
  3.     initialize_with { new(attributes) }
  4.     name { &#39;Grace&#39; }
  5.   end
  6. end

huangapple
  • 本文由 发表于 2023年6月15日 06:18:13
  • 转载请务必保留本文链接：https://go.coder-hub.com/76477924.html
  • factory-bot
  • ruby
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