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Editorial Team
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Asked: 2026-06-08T02:11:20+00:00

Im using redis to store tags for certain entities. Examples of the data: +————-+——————————–+

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Im using redis to store tags for certain entities. Examples of the data:

+-------------+--------------------------------+
|     key     |             value              |
+-------------+--------------------------------+
| book:1:tags |     [python, ruby, rails]      |
+-------------+--------------------------------+
| book:2:tags |     [fiction, fantasy]         |
+-------------+--------------------------------+
| book:3:tags |     [fiction, adventure]       |
+-------------+--------------------------------+

How do I find all books with a particular tag, ie all books tagged with fiction?

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1 Answer

  1. Editorial Team

    You have to maintain reverse indexes yourself. Along with those keys that you posted, you should create reverse references.

    tag:python => [1]
tag:ruby => [1]
tag:rails => [1]

tag:fiction => [2, 3]
tag:fantasy => [2]
tag:adventure => [3]

    Then it’s trivial to do what you want. But maybe you should consider using another tool for the job. For example, MongoDB can efficiently index and query arrays.

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