如何执行“移动字段”重构活动记录模型

发布于 2024-09-24 12:28:30 字数 532 浏览 3 评论 0原文

这是一种相当常见的重构，Martin Fowler 称之为“移动领域”。给定 3 个模型：

class Person < ActiveRecord::Base
  has_one :contact_details
  has_one :address
end

class ContactDetails < ActiveRecord::Base
end

class Address < ActiveRecord::Base
end

如何重构（包括迁移）从 Person 到 ContactDetails 的 has_one 地址？之后模型将如下所示：

class Person < ActiveRecord::Base
  has_one :contact_details
end

class ContactDetails < ActiveRecord::Base
  has_one :address
end

class Address < ActiveRecord::Base
end

原文

This is a fairly common refactoring, Martin Fowler calls it 'move field'. Given 3 models:

class Person < ActiveRecord::Base
  has_one :contact_details
  has_one :address
end

class ContactDetails < ActiveRecord::Base
end

class Address < ActiveRecord::Base
end

how do I refactor, including migration, the has_one address from Person to ContactDetails? Afterwards the models would look like:

class Person < ActiveRecord::Base
  has_one :contact_details
end

class ContactDetails < ActiveRecord::Base
  has_one :address
end

class Address < ActiveRecord::Base
end

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超可爱的懒熊 2024-10-01 12:28:30

所以我已经完成了迁移，实际上非常简单，只需要重命名地址上的外键

class MoveAddressFromPersonToContactDetails < ActiveRecord::Migration

  def self.up
    rename_column :addresses, :person_id, :contact_details_id
  end

  def self.down
    rename_column :addresses, :contact_details_id, :person_id
  end

end

，所以剩下的就是以某种方式重构代码。

So I've got as far as the migration, pretty simple actually, just need to rename the foreign key on addresses

class MoveAddressFromPersonToContactDetails < ActiveRecord::Migration

  def self.up
    rename_column :addresses, :person_id, :contact_details_id
  end

  def self.down
    rename_column :addresses, :contact_details_id, :person_id
  end

end

so all that's left is to refactor the code, somehow.

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