Question

我是新手，非常感谢您如何解决此问题。我试图按照DataMapper中的文档进行操作，并且没有通过Google找到有关如何销毁对象及其相应链接的任何解决方案。以下是关键代码段。

模型

class Entity

包括DataMapper :: Resource

property：entity_id，Serial property：full_legal_name，String property：tax_id，String property：phone_number，String property：fax_number，String property：cell_number，String property：email，String，：unique =＆gt; true，：format =＆gt; ：电子邮件地址 property：alt_email，String property：is_active，Boolean property：created_at，DateTime property：created_by，String property：updated_at，DateTime property：updated_by，String property：auto_pay，Boolean property：use_ach，Boolean property：prefix，String property：first_name，String property：middle_name，String property：last_name，String property：suffix，String property：referral_code，String property：login_name，String，：unique =＆gt;真正 property：hashed_password，String，：length =＆gt; 200 property：salt，String property：permission_level，Integer property：title，String property：greeting，String property：preferred_name，String property：preferred_language，String property：security_question，String property：security_answer，String property：signature_font，String property：auth1_checkbox，Boolean property：auth2_checkbox，Boolean property：auth3_checkbox，布尔值 property：auth4_checkbox，布尔值 property：auth5_checkbox，布尔值 property：auth6_checkbox，Boolean property：digital_signature，String property：date_signed，DateTime property：signatory_ip，String property：signatory_title，String

有n，：地址，：通过=＆gt;资源有n，：疼痛有n，：信用卡

端

class Person＆lt;实体

属性：birthdate，String property：drivers_license_number，String property：state_issuing_drivers_license，String

端

类公司＆lt;实体

property：dba_name，String property：legal_structure，String property：url，String，：format =＆gt; ：URL

端

班级地址

包括DataMapper :: Resource

property：address_id，Serial property：esid，String，：unique =＆gt;真正 property：description，String property：address_line1，String property：address_line2，String property：city，String property：state，String property：zipcode，String property：country，String property：meter_number，String property：meter_type，String property：meter_status，String property：meter_status_date，DateTime property：updated_by，String property：switch_indicator，String property：switch_type，String property：selected_switch_date，日期 property：under_contract，Boolean property：contract_end_date，Date

有n，：entities，：through =＆gt;资源

端

对象创建和持久性

     if session[:base_route].to_s == "residential"
   #residential processing
   @entity_id = session[:this_person].inspect
   @person = Person.get(@entity_id.to_i)
   @address = Address.new()
   @address.esid = params[:post][:esid]
   @address.description = params[:post][:service_location_description]
   @address.address_line1 = params[:post][:service_address_line1]
   @address.address_line2 = params[:post][:service_address_line2]
   @address.city = params[:post][:service_city_name]
   @address.state = params[:post][:service_state_name]
   @address.zipcode = params[:post][:service_zip_code]
   @address.switch_indicator = params[:post][:switch_indicator]
   @address.switch_type = params[:post][:switch_type]
   params[:post][:under_contract_checkbox]  == "on" ? @under_contract = true : @under_contract = false 
   @address.under_contract = @under_contract

   @person.addresses << @address

   if @person.save

尝试对象和链接销毁（链接被破坏，但地址销毁不起作用）

    @entity_id = session[:this_person].inspect
    address = Address.get(params[:post][:submit].to_i)
    address.destroy
    entity = Entity.get(@entity_id)
    link = entity.address_entities.get(@entity_id, params[:post][:submit])
    link.destroy

非常感谢任何提示或建议。

Answer 1

删除答案对象失败，因为答案对象和实体对象之间存在链接。通过颠倒顺序并首先删除链接和第二个对象，该对象将被销毁。

@entity_id = session[:this_person].inspect
entity = Entity.get(@entity_id)
link = entity.address_entities.get(@entity_id, params[:post][:submit])
link.destroy
address = Address.get(params[:post][:submit].to_i)
address.destroy

如何在DataMapper / Sinatra / Ruby中销毁多对多对象及其链接

1 个答案: