如何保存具有嵌套屬性的多態模型的belongs_to關聯？

Question

比如我有這些模型：

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 

我試圖挽救Company與嵌套屬性，你可以假設這爲PARAMS：

{"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"}} 

這不工作，因爲它拒絕並且在可尋址時不存儲數據（addressable_id和addressable_type）爲main_address不存在，即使當我試圖在Company類的main_address_attributes=(attributes)方法中添加它時。

每當我試圖挽救這與上述PARAMS我得到這個錯誤：

Main address addressable can't be blank 

我該如何解決這個問題？

Answer 1

萬一有belongs_to你會碰到這樣的：company相關address（通過main_address_id），它的回報是通過多態addressable與另一個（Company或Person）。

至於例如，你可以改變：

has_one :address, as: :addressable 

到：

has_many :address, as: :addressable 

，然後添加到您的Address：

enum address_type: [:primary, :secondary]