Conflicting $set when assigning embeds_many attributes on a new embedded document

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Unknown
    • 9.1.2, 9.0.13
    • Affects Version/s: 9.1.1, 9.0.12
    • Component/s: Autosave, Persistence
    • None
    • None
    • Fully Compatible
    • Ruby Drivers
    • Not Needed
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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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      A new (unsaved) `embeds_one` document under a persisted parent gets its `embeds_many` association assigned through `assign_attributes`. On save, Mongoid sends two `$set` keys, one for the whole embedded document and one for its child array, and the server rejects the update:

      Mongo::Error::OperationFailure: [40]: Updating the path 'group.items' would create a conflict at 'group'

      Assigning the same array with the plain setter (`group.items = [...]`) saves correctly.

      Failing case:

      Given:

      class Item
  include Mongoid::Document
  field :name, type: String
  embedded_in :group
end

class Group
  include Mongoid::Document
  field :matcher, type: String
  embedded_in :parent
  embeds_many :items
end

class Parent
  include Mongoid::Document
  embeds_one :group, autobuild: true
end

      Then:
       

      parent = Parent.find(Parent.create!.id)
parent.build_group(matcher: 'all')
parent.group.assign_attributes(items: [{ name: 'a' }])
parent.save!  # raises OperationFailure [40]

      Nested attributes into an autobuilt `embeds_one` fail the same way:

      parent.assign_attributes(group: { matcher: 'all', items: [{ name: 'a' }] })
parent.save!  # raises OperationFailure [40]

        1. repro.rb
          2 kB
          Kieran Pilkington (EXT)

            Assignee:
            Jamis Buck
            Reporter:
            Kieran Pilkington (EXT)
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            3 Start watching this issue

              Created:
              Updated:
              Resolved: