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  1. C# Driver
  2. CSHARP-4079

Implement positional update operators in LINQ3

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 2.16.0
    • Affects Version/s: 2.14.0
    • Component/s: LINQ3
    • Labels:
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    • Needed
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      1. What would you like to communicate to the user about this feature?
      We should document all the positional update operators with code examples:
      x.A.FirstMatchingElement() => "A.$"
      x.A.AllElements() => "A.$[]"
      x.A.AllMatchingElements("identifier") => "A.$[identifier]"

      We should add this to our UpdateOne and/or UpdateMany documentation as an advanced usage. We can mirror the server examples and show how to write these using C# syntax:
      https://www.mongodb.com/docs/manual/reference/operator/update/positional/
      https://www.mongodb.com/docs/manual/reference/operator/update/positional-all/
      https://www.mongodb.com/docs/manual/reference/operator/update/positional-filtered/

      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      Yes.

      3. Which versions of the driver/connector does this apply to?
      2.16.0 and later. Ideally add this to 2.19 and later docs, but minimally add it to latest.

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      1. What would you like to communicate to the user about this feature? We should document all the positional update operators with code examples: x.A.FirstMatchingElement() => "A.$" x.A.AllElements() => "A.$[]" x.A.AllMatchingElements("identifier") => "A.$ [identifier] " We should add this to our UpdateOne and/or UpdateMany documentation as an advanced usage. We can mirror the server examples and show how to write these using C# syntax: https://www.mongodb.com/docs/manual/reference/operator/update/positional/ https://www.mongodb.com/docs/manual/reference/operator/update/positional-all/ https://www.mongodb.com/docs/manual/reference/operator/update/positional-filtered/ 2. Would you like the user to see examples of the syntax and/or executable code and its output? Yes. 3. Which versions of the driver/connector does this apply to? 2.16.0 and later. Ideally add this to 2.19 and later docs, but minimally add it to latest.

      In LINQ2, you could use the magic number -1 to indicate use of the positional operator, but this no longer works in LINQ3. When calling UpdateOneAsync, UpdateManyAsync, and related operations, the following code works in LINQ2, but fails in LINQ3:

      await collection.UpdateOneAsync(l => l.Id == another.Id && l.AnArrayMember.Any(l => l.Id == anArrayId),
                    Builders<ModelClass>.Update.Set(l => l.AnArrayMember.ElementAt(-1).Deleted, true));

      In LINQ3 this fails with the error "Cannot create field '-1' in element [...]". In LINQ2 it successfully translated it into "AnArrayMember.$.Deleted" and the Set command completed fine.

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            james.kovacs@mongodb.com James Kovacs
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              Created:
              Updated:
              Resolved: