[jira] [Created] (COUCHDB-2867) Mango: should be able to index *within* arrays

["Nolan Lawson (JIRA)" <ji...@apache.org>]

Nolan Lawson created COUCHDB-2867:
-------------------------------------

             Summary: Mango: should be able to index *within* arrays
                 Key: COUCHDB-2867
                 URL: https://issues.apache.org/jira/browse/COUCHDB-2867
             Project: CouchDB
          Issue Type: Improvement
          Components: Mango
            Reporter: Nolan Lawson


If you have a document like:

{code:javascript}
{
  "_id": "foo",
  "tags": ["a", "b", "c"]
}
{code}

...then you should be able to run queries that find e.g. all documents with "a" as a tag, and it should be *indexed*. Currently there doesn't seem to be any way to do this except as an in-memory selector, which is a real bummer, because it's a super common use case. (Tags, categories, labels, etc.)

Originally I thought this was how {{$elemMatch}} worked, and I was surprised to learn that that's not the case.



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