Uploaded image for project: 'Mongoid'
  1. Mongoid
  2. MONGOID-3025

strange behaviour when calling #destroy_all on embedded documents

    XMLWordPrintable

    Details

      Description

      Hi, here we have two documents Entity and EntityLink (embedded into Entity).
      Running this scripts (mongoid 3.1.3) will:

      • create 2 entities ("entity" and "entity_b") using Entity.create!(...)
      • create an embedded EntityLink in each of the two (using entity.links.find_or_create_by(...))
      • destroy the links created above with entity.links.destroy_all
      • reloading the entities with entity.reload
      • see the links reappear

      As you can see the first test (test A) fails, while the others pass. Why?

      thanks

       
      require 'mongoid'
       
       
       
      class Entity
        include Mongoid::Document
        field :name, type: String
        embeds_many :links, class_name: "EntityLink"
      end
       
       
      class EntityLink
        include Mongoid::Document
       
        embedded_in :entity
       
        field :le, type: Moped::BSON::ObjectId
        field :last_seen, type: Integer
      end
       
       
       
       
      def add_link first_entity, second_entity, update_attributes = true
        first_link = first_entity.links.find_or_create_by(le: second_entity._id)
        first_link.update_attributes!(last_seen: Time.now.to_i) if update_attributes
       
        second_link = second_entity.links.find_or_create_by(le: first_entity._id)
        second_link.update_attributes!(last_seen: Time.now.to_i) if update_attributes
      end
       
       
       
      def expect exp
        puts exp ? 'ok' : 'FAIL'
      end
       
       
      Mongoid.load! './config_mongoid.yaml', :development
       
      puts '===test A===================================================='
      Mongoid.purge!
       
      entity = Entity.create!(name: 'entity')
      entity_b = Entity.create!(name: 'entity_b')
       
      add_link entity, entity_b
       
      expect entity.links.size == 1
       
      entity.links.destroy_all
      expect entity.links.size == 0
       
      entity.reload
      # this fails, why??
      expect entity.links.size == 0
       
      puts '===test B===================================================='
      Mongoid.purge!
       
      entity = Entity.create!(name: 'entity')
      entity_b = Entity.create!(name: 'entity_b')
       
      add_link entity, entity_b
       
      expect entity.links.size == 1
       
      entity.reload
      entity.links.destroy_all
      expect entity.links.size == 0
       
      entity.reload
      # using reaload before entity.links.destroy_all make this test pass
      expect entity.links.size == 0
       
      puts '====test C==================================================='
      Mongoid.purge!
       
      entity = Entity.create!(name: 'entity')
      entity_b = Entity.create!(name: 'entity_b')
       
      add_link entity, entity_b, false
       
      expect entity.links.size == 1
       
      entity.links.destroy_all
      expect entity.links.size == 0
       
      entity.reload
      # without updating EntityLink attributes it seems to work
      expect entity.links.size == 0
       
      puts '=====test D=================================================='
      Mongoid.purge!
       
      entity = Entity.create!(name: 'entity')
      entity_b = Entity.create!(name: 'entity_b')
       
      add_link entity, entity_b
       
      expect entity.links.size == 1
       
      entity.links.where({}).destroy_all
      expect entity.links.size == 0
       
      entity.reload
      # using entity.links.where({}).destroy_all (instead of entity.links.destroy_all) make this test pass
      expect entity.links.size == 0
      
      

        Attachments

          Activity

            People

            Assignee:
            durran.jordan Durran Jordan
            Reporter:
            topac topac
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved: