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  1. Core Server
  2. SERVER-14160

Cannot project subfield of _id

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    • Type: Icon: Improvement Improvement
    • Resolution: Duplicate
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: 2.4.10, 2.6.1
    • Component/s: Querying
    • None
    • Query

      if _id is an object you cannot project out on of it's members in a normal projection, you can using $project in aggregation

      > db.foo.insert({_id:{a:1,b:1}})
WriteResult({ "nInserted" : 1 })
> db.foo.find({},{_id:0,"_id.a":1})
{  }

            Assignee:
            backlog-server-query Backlog - Query Team (Inactive)
            Reporter:
            john.page@mongodb.com John Page
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              Created:
              Updated:
              Resolved: