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Type: Task
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Resolution: Fixed
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Priority: Major - P3
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Affects Version/s: None
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Component/s: None
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Labels:
Documentation Request Summary:
Aggregation date expressions will accept input of type ObjectId.
Engineering Ticket Description:
Since ObjectId() encompasses an approximation of insertion date it would be helpful if _id/things of ObjectId() type could be operated/projected the same way as Datetime type object.
{case}{$project:{$year:"$_id"}} would extract year out of ObjectId().getTimestamp equivalent.{case}
One question would be whether ObjectId could be operated on directly via date/interval arithmetic. I.e. whether it can be used anywhere a date can be used returning a standard Datetime type as a result from say {$subtract:["$_id",86400000]} which can only return ts of one day before that ObjectId's timestamp.
- documents
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SERVER-9406 Allow treating ObjectId type as date in $project phase
- Closed