ruby-on-rails - 如何在活动记录模型上执行“移动字段”重构

Question

这是一个相当常见的重构，Martin Fowler 称之为“移动域”。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

Answer 1

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.