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  1. Core Server
  2. SERVER-9156

Projection by a substring match

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    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 2.4.1
    • Fix Version/s: None
    • Component/s: Aggregation Framework
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      Description

      Let's start from an example: suppose that each document in a collection contains a UserAgent string as a field. Androids have something like "xxxxxx Android xxxx", iOS have something like "xxxxxxx iPad/iPhone xxxxxx".

      I would like to count those documents, grouped by platform (Android, iPad, iPhone). To get the platform, all I need is to count them by a substring match. For example, /Android/ vs /iPad/ vs /iPhone/ (each counted separately).

      Any solution with aggregation framework will make it for me. I can clarify/whirpool on any request with pleasure.

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