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  1. Mongoid
  2. MONGOID-3476

Selectable exists() misbehavior on inherited fields

    • Type: Icon: Task Task
    • Resolution: Done
    • 4.0.0 final
    • Affects Version/s: None
    • Component/s: None

      Hello, it seems that querying/selecting fields present only in inherited classes misses:

      class Transaction
      include Mongoid::Document
      has_many :events
      end

      class Event
      include Mongoid::Document
      belongs_to :transaction
      end

      class LoanEvent < Event
      field :pause, :type => String
      end

      Now:

      muichkine@ubuntu:~/src/white$ rails c test
      Loading test environment (Rails 4.0.2)
      2.0.0p353 :001 > tr = Transaction.last

      There are events

      2.0.0p353 :002 > tr.events.count
      => 109

      108 are loans:

      2.0.0p353 :003 > tr.events.loans.count
      => 108

      Some events have the pause field set:

      2.0.0p353 :004 > tr.events.loans.map

      { |event| event.read_attribute :pause }

      => ["WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", "WITH_INTERESTS_PAYMENT", nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil]

      There are exactly 36:

      2.0.0p353 :005 > tr.events.loans.map

      { |event| event.read_attribute :pause }

      .compact.count
      => 36

      and yet:

      2.0.0p353 :006 > tr.events.loans.exists(:pause =>true).count
      => 108

      Here is the query:

      2.0.0p353 :007 > tr.events.loans.exists(:pause =>true)
      => #<Mongoid::Criteria
      selector: {"transaction_id"=>BSON::ObjectId('52c1581c7562754a6d040000'), "_type"=>

      {"$in"=>["LoanEvent"]}

      , "pause"=>{"$exists"=>true}}
      options: {:sort=>{"s"=>1}}
      class: Event
      embedded: false>

            Assignee:
            durran Durran Jordan
            Reporter:
            muichkine Olivier Milla
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              Created:
              Updated:
              Resolved: