如何為具有嵌套屬性的多態模型保存一個longate_to關聯？

Question

例如，我有以下模型：

class Person < ActiveRecord::Base
  # attributes: id, name
  has_one :address, as: :addressable
  accepts_nested_attributes_for :address
end

class Company < ActiveRecord::Base
  # attributes: id, name, main_address_id
  has_one :address, as: :addressable
  belongs_to :main_address, class_name: 'Address', foreign_key: :main_address_id

  accepts_nested_attributes_for :main_address

  def main_address_attributes=(attributes)
    puts '='*100
    puts attributes.inspect
    self.build_main_address(attributes)
    self.main_address.addressable_id = self.id
    self.main_address.addressable_type = self.class.to_s
    puts self.inspect
    puts self.main_address.inspect
  end
end

class Address < ActiveRecord::Base
  # attributes: id, address1, address2, city_id,..
  belongs_to :addressable, polymorphic: true
  validates :addressable_id, :addressable_type, presence: true
end

我正在嘗試使用嵌套屬性保存Company ，您可以將其視為參數：

{"name"=>"Test Company", "email"=>"", "display_name"=>"Company pvt ltd", "description"=>"Company desc", "founded_in"=>"2014-08-05", "website"=>"", "main_address_attributes"=>{"address1"=>"My address1", "address2"=>"My address2", "city_id"=>"10"}}

這不起作用，因為當main_address的 addressable（ addressable_id和addressable_type ）不存在時，即使我試圖在Company類的main_address_attributes=(attributes)方法中添加它，它也拒絕並且不保存數據。

每當我嘗試使用上述參數保存時，都會出現此錯誤：

Main address addressable can't be blank

我該如何解決？

Answer 1

如果使用belongs_to您將擁有類似以下內容的信息：與address相關的company （通過main_address_id ），而該address通過多態addressable與另一個（ Company或Person ）相關。

例如，您可以更改：

has_one :address, as: :addressable

至：

has_many :address, as: :addressable

然后添加到您的Address ：

enum address_type: [:primary, :secondary]