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I am trying to pull/remove values from an array (subdocument). Example doc: { _id: 5150a1199fac0e6910000002, name: 'some name, items: [{ id: 23, name: 'item name 23' },{ id: 24, name: 'item name 24' }] } I have the doc in memory as I pulled it from mongo already. I am trying: var left = object.items.pull({id: 24}); console.log(left) Outputs: [{ id: 23, name: 'item name 23', _id: 5150a1199fac0e6910000045 },{ id: 24, name: 'item name 24', _id: 5150a1199fac0e6910000002 }] So looks like I already have a problem. The array returned from the pull call should be whats left in the array after the pull . Not sure why it did not pull from the item array. Does this only support pulling by ObjectId ant not user defined fields? I call save: object.save(); Mongoose logs this as the query: Mongoose: mycollection.update({ _id: ObjectId("5150901ac345824a07000002"), __v: 3 }) { '$inc': { __v: 1 }, '$pull': { attachments: { _id: { '$in': [ ObjectId("5150c64d63773efb1f000002") ] } } } } {} This shows why my document is not being removed. The _id of the array item that should be removed is: _id: 5150a1199fac0e6910000002 The item that mongoose is sending to the database to remove is: ObjectId("5150c64d63773efb1f000002") Any ideas what I am doing wrong? I am trying to delete by something other than _id, not sure if that is possible but from the docs looks to be.

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