Unexpected field in deserialization for projection expression with a positional operator

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    • Type: Bug
    • Resolution: Gone away
    • Priority: Major - P3
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    • Affects Version/s: 2.10.4
    • Component/s: LINQ, Serialization
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      var find = collection.Find(x => x.ArrayField.Any(predicate));

var a = find.Project<TypeOfX>(
        Builders<TypeOfX>.Projection
            .Include(x => x.ArrayField[-1])
            .Exclude(x => x.Id)
    )
    .FirstOrDefault() // <-- OK
    ?.ArrayField[0];

var b = find.Project(x => x.ArrayField[-1])
    .FirstOrDefault(); // <-- MongoInternalException: Unexpected field

      Both a and b should be the same, but b throws an exception.
      If FirstOrDefault() is replaced with ToString(), both queries are exactly the same. There is a bug in the projection object deserializer.

            Assignee:
            Mikalai Mazurenka (Inactive)
            Reporter:
            TimTIM Wong
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              Created:
              Updated:
              Resolved: