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  1. C# Driver
  2. CSHARP-1893

New DistinctMany method which is like Distinct but for array fields.

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    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 2.24.0
    • Affects Version/s: 2.4.1
    • Component/s: API, Linq
    • None
    • Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

      New DistinctMany method may need to be documented.

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to? New DistinctMany method may need to be documented.

      The Distinct method of IMongoCollection assumes that the member is a scalar value:

      IAsyncCursor<TField> Distinct<TField>(FieldDefinition<TDocument, TField> field, FilterDefinition<TDocument> filter, DistinctOptions options = null, CancellationToken cancellationToken = default(CancellationToken))

      Because of the way Distinct works with array members an additional overload is needed to correctly handle array members:

      IAsyncCursor<TItem> DistinctMany<TItem>(FieldDefinition<TDocument, IEnumerable<TField>> field, FilterDefinition<TDocument> filter, DistinctOptions options = null, CancellationToken cancellationToken = default(CancellationToken))

      Note that the return values are of type TItem, not TField.

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            robert@mongodb.com Robert Stam
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              Created:
              Updated:
              Resolved: