Document using Mongoid::Timestamps does not persist its embeds_one documents

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Unknown
    • None
    • Affects Version/s: 9.1.0
    • Component/s: None
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    • Ruby Drivers
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      Documents using Mongoid::Timestamps do not persist their embeds_one documents.

      A/B (without Timestamps), X/Y (with Timestamps) :

       

      ::Object.send(:remove_const, :A)
::Object.send(:remove_const, :B)
::Object.send(:remove_const, :X)
::Object.send(:remove_const, :Y)


class A
  include ::Mongoid::Document


  embeds_one :b
end


class B
  include ::Mongoid::Document


  embedded_in :a
end


class X
  include ::Mongoid::Document
  include ::Mongoid::Timestamps # <-----------------------------     

  embeds_one :y
end


class Y
  include ::Mongoid::Document


  embedded_in :x
end


puts(
  [
    ::Mongoid::VERSION,
    nil,
    a = ::A.create!,
    a.create_b,
    a.reload.b,
    a.delete,
    nil,
    x = ::X.create!,
    x.create_y,
    x.reload.y,
    x.delete
  ].map(&:inspect)
)

      "Y" document persisted using Mongoid 9.0.11

      "9.0.11"
nil
#<A _id: 6a552cc6c20215549c264565, >
#<B _id: 6a552cc6c20215549c264566, >
#<B _id: 6a552cc6c20215549c264566, >
true
nil
#<X _id: 6a552cc6c20215549c264567, created_at: 2026-07-13 18:21:58.53 UTC, updated_at: 2026-07-13 18:21:58.533 UTC>
#<Y _id: 6a552cc6c20215549c264568, >
#<Y _id: 6a552cc6c20215549c264568, >
true

      "Y" document NOT persisted using Mongoid 9.1.0 

      "9.1.0"
nil
#<A _id: 6a552c8f4f4cd6ca495a7bb6, >
#<B _id: 6a552c8f4f4cd6ca495a7bb7, >
#<B _id: 6a552c8f4f4cd6ca495a7bb7, >
true
nil
#<X _id: 6a552c8f4f4cd6ca495a7bb8, created_at: 2026-07-13 18:21:03.575 UTC, updated_at: 2026-07-13 18:21:03.581 UTC>
#<Y _id: 6a552c8f4f4cd6ca495a7bb9, >
nil # <-----------------------------
true

       

            Assignee:
            Dmitry Rybakov
            Reporter:
            Sylvain Bernier (EXT)
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              Created:
              Updated:
              Resolved: