How to create trigger to check geometry validity?

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I want to create trigger to check geometry validity in spatial table. I have a table:

CREATE TABLE vec_geometry ( id bigserial is_valid boolean, invalid_reason character(128), geom geography)When I try to create trigger function I get the error:

CREATE FUNCTION geom_valid_check() RETURNS trigger AS$BODY$WITH test as (SELECT * FROM ST_IsValidDetail(NEW.geom))UPDATE vec_geometry SET is_valid = (SELECT valid FROM test), invalid_reason = (SELECT reason FROM test)WHERE id = NEW.id;RETURN NULL;$BODY$LANGUAGE plpgsql VOLATILE NOT LEAKPROOF;An error has occurred:ERROR: syntax error at or near "WITH"LINE 3: WITH test as (SELECT * FROM ST_IsValidDetail(NEW.geom))How to rewrite function to make it work?



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