I am testing a new subscripting interface for jsonb, and I found one issue.
DO $$ DECLARE v jsonb; BEGIN v['a'] = '"Ahoj"'; RAISE NOTICE '%', v['a']; END; $$; NOTICE: "Ahoj" DO
When I use this interface for reading, the jsonb type is returned. What is the correct way for casting from jsonb text to text value? I would not double quotes inside the result. Cast to text doesn't help. For operator API we can use "->>" symbol. But we have nothing similar for subscript API.
now I need function like
CREATE OR REPLACE FUNCTION public.value_to_text(jsonb) RETURNS text LANGUAGE plpgsql IMMUTABLE AS $function$ DECLARE x jsonb; BEGIN x['x'] = $1; RETURN x->>'x'; END; $function$
DO $$ DECLARE v jsonb; BEGIN -- hodnota musi byt validni json v['a'] = '"Ahoj"'; RAISE NOTICE '%', value_to_text(v['a']); END; $$; NOTICE: Ahoj DO
Is it possible to do this with built functionality?
I miss the cast function for json scalar string value to string.
