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I'm writing a Rails 4 app and have a string array column on one of my models called identifiers. When the user passes in a list of identifiers, what's the syntax to fetch the rows where any of the given identifiers match any of the stored identifiers?

I'm trying where('ARRAY[?] == any(identifiers)', ids), but that doesn't seem to work.

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Is this column being serialized in your model? –  BroiSatse yesterday
 
No serialization happens... Postgres natively supports arrays on columns. –  Sudhir Jonathan 12 hours ago
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1 Answer

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Use the array operator "overlap": &&

SELECT * FROM tbl WHERE ARRAY[1,2,3] && identifiers

Or:

SELECT * FROM tbl WHERE '{1,2,3}'::int[] && identifiers

You did not disclose the exact type, which must match, of course. My example is for integer arrays.

This form can utilize a GIN index on the identifiers column:

CREATE INDEX tbl_identifiers_gin_idx ON tbl USING GIN (identifiers);
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