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Docs for facet-by-JSON-array, closes #477

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Simon Willison 2019-05-19 14:19:35 -07:00
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docs/facets.rst
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@ -128,3 +128,12 @@ The performance of facets can be greatly improved by adding indexes on the colum
SQLite version 3.19.3 2017-06-27 16:48:08
Enter ".help" for usage hints.
sqlite> CREATE INDEX Food_Trucks_state ON Food_Trucks("state");
Facet by JSON array
-------------------
If your SQLite installation provides the ``json1`` extension (you can check using :ref:`JsonDataView_versions`) Datasette will automatically detect columns that contain JSON arrays of values and offer a faceting interface against those columns.
This is useful for modelling things like tags without needing to break them out into a new table.
You can try this functionality out at `latest.datasette.io/fixtures/facetable?_facet_array=tags <https://latest.datasette.io/fixtures/facetable?_facet_array=tags>`__