"Function unaccent(text) does not exist" in update trigger



  • I've created a trigger for table x1 to update a column y with the expression to_tsvector(unaccent(x1.col1 || ' ' || x2.col1)). This trigger function throws:

    function unaccent(text) does not exist
    

    Why would this function not exist when a trigger is called, but exist when executed manually? I'm using Supabase to manage this database.



  • The function unaccent() is typically the one installed by the additional module https://www.postgresql.org/docs/current/unaccent.html . See:

    • https://stackoverflow.com/a/11007216/939860

    Additional modules can be installed to any schema. (I like to use a dedicated schema.) See:

    • https://dba.stackexchange.com/questions/107389/is-it-recommended-to-install-extensions-into-pg-catalog-schema/107418#107418

    If so, then the schema must be added to the https://stackoverflow.com/a/9067777/939860 to allow function calls without schema-qualification like you demonstrate.

    The obvious explanation for your observation would be that you call the function in one session with an appropriate search_path, and execute the trigger in another session with a different search_path.

    To diagnose, add this line to your PL/pgSQL trigger function just before the command calling unaccent() temporarily (and make sure notices are logged or reported to the client, depending on where you look):

    RAISE NOTICE 'Current search_path: %', current_setting('search_path');
    

    The simple & safe fix is to schema-qualify the function name. Like:

    my_extension_schema.unaccent(text)
    

    But investigate whether schemas and the search_path are handled properly across your DB cluster ...




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