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Editorial Team
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Asked: 2026-05-26T23:42:20+00:00

Using MongoDB… If I have an array of ids in one field, can I

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Using MongoDB…

If I have an array of ids in one field, can I quickly query it for containing id_x?

If so how would I insure and index on it so it is as fast as possible?

Thanks!

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1 Answer

  1. Editorial Team

    Yes, you can just build an index on that field. That the key has multiple values makes no difference in how you do that. They call this the Multikey feature.

      db.articles.ensureIndex( { tags : 1 } )

    And the query is the same as well:

     db.articles.find( { tags: 'april' } )

    It just happens to hit any document which has (at least) that tag.

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