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  1. Mongoid
  2. MONGOID-2681

Using #only with embedded documents sets omitted fields to default values

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    • 3

      If you have an object that has been retrieved via #only, you can be subject to data loss when saving that model.

      class Parent
  include Mongoid::Document
  embeds_one :child
end

class Child
  include Mongoid::Document
  embedded_in :parent
  field :a, :type => Integer, :default => 0
  field :b, :type => Integer, :default => 0
  field :c, :type => Integer, :default => 0
end

Parent.delete_all()
p = Parent.new
p.build_child(:a => 10, :b => 20, :c => 30)
p.save()

Mongoid::IdentityMap.clear
p = Parent.only(:_id, 'child._id', 'child.a').first
p.child.a = 40
p.save()
p.reload()
p.child
# => #<Child _id: 50eb642bdd365a121b00000c, a: 40, b: 0, c: 0>

            Assignee:
            oleg.pudeyev@mongodb.com Oleg Pudeyev (Inactive)
            Reporter:
            jonhyman Jon Hyman
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              Created:
              Updated:
              Resolved: