如何通过 has_many 关联在 FactoryBot 中设置工厂

或者，您可以使用块并跳过 association 关键字。这样就可以在不保存到数据库的情况下构建对象（否则，has_many 关联会将您的记录保存到数据库中，即使您使用 build 函数而不是 create 也是如此）。

FactoryGirl.define do
  factory :listing_with_features, :parent => :listing do |listing|
    features { build_list :feature, 3 }
  end
end

---

创建这些类型的关联需要使用 FactoryGirl 的回调。

可以在此处找到一组完美的示例。

https://thoughtbot.com/blog/aint-no-calla-back-girl

把它带回家你的例子。

Factory.define :listing_with_features, :parent => :listing do |listing|
  listing.after_create { |l| Factory(:feature, :listing => l)  }
  #or some for loop to generate X features
end

---

您可以使用 trait：

FactoryGirl.define do
  factory :listing do
    ...

    trait :with_features do
      features { build_list :feature, 3 }
    end
  end
end

使用 callback，如果您需要创建数据库：

...

trait :with_features do
  after(:create) do |listing|
    create_list(:feature, 3, listing: listing)
  end
end

在您的规格中使用如下：

let(:listing) { create(:listing, :with_features) }

这将消除您工厂中的重复，并且更加可重用。

https://robots.thoughtbot.com/remove-duplication-with-factorygirls-traits

---

我尝试了几种不同的方法，这是对我来说最可靠的方法（适用于您的情况）

FactoryGirl.define do
  factory :user do
    # some details
  end

  factory :layout do
    # some details
  end

  factory :feature do
    # some details
  end

  factory :listing do
    headline    'headline'
    home_desc   'this is the home description'
    association :user, factory: :user
    association :layout, factory: :layout
    after(:create) do |liztng|
      FactoryGirl.create_list(:feature, 1, listing: liztng)
    end
  end
end

---

从 FactoryBot v5 开始，关联保留了构建策略。关联是解决此问题的最佳方式，docs have good examples for it：

FactoryBot.define do
  factory :post do
    title { "Through the Looking Glass" }
    user
  end

  factory :user do
    name { "Taylor Kim" }

    factory :user_with_posts do
      posts { [association(:post)] }
    end
  end
end

或控制计数：

    transient do
      posts_count { 5 }
    end

    posts do
      Array.new(posts_count) { association(:post) }
    end

---

这是我的设置方式：

# Model 1 PreferenceSet
class PreferenceSet < ActiveRecord::Base
  belongs_to :user
  has_many :preferences, dependent: :destroy
end

#Model 2 Preference

class Preference < ActiveRecord::Base    
  belongs_to :preference_set
end



# factories/preference_set.rb

FactoryGirl.define do
  factory :preference_set do
    user factory: :user
    filter_name "market, filter_structure"

    factory :preference_set_with_preferences do
      after(:create) do |preference|
        create(:preference, preference_set: preference)
        create(:filter_structure_preference, preference_set: preference)
      end
    end
  end

end

# factories/preference.rb

FactoryGirl.define do
  factory :preference do |p|
    filter_name "market"
    filter_value "12"
  end

  factory :filter_structure_preference, parent: :preference do
    filter_name "structure"
    filter_value "7"
  end
end

然后在您的测试中，您可以执行以下操作：

@preference_set = FactoryGirl.create(:preference_set_with_preferences)

希望有帮助。

---

与 @thisismydesign 类似，但它在我的末端创建了一个额外的 post（FactoryBot v6.2）。

为了避免这种情况，我添加了关键字 instance，如下所示：

FactoryBot.define do
  factory :post do
    title { "Through the Looking Glass" }
    user
  end

  factory :user do
    name { "Taylor Kim" }

    factory :user_with_posts do
      posts { [association(:post, user: instance)] }
    end
  end
end

---