How to loop from an array received as a parameter in plpgsql function? - arrays

Question

I'm kinda new into pgplsql and so far I have to create a function that loops an array that is received as a function.
The main idea of the function is to insert new records into a table that maps each id contained in the array received with a new formatted id, the format depends on the second parameter received and return the table "idsTable".
The problem is that when I try to create the function it sends me an error:
ERROR: loop variable of FOREACH must be a known variable or list of variables
LINE 38: FOREACH objectid IN ARRAY idsList LOOP
I'm not sure if I have to declare the objectid variable cause in the examples that I have seen they didn't.
So far I have this:
CREATE OR REPLACE FUNCTION createId(idsList varchar[], objectType varchar)
RETURNS TABLE(original_id varchar, new_id char) as
$$
BEGIN
IF LOWER(objectType) = 'global' THEN
FOREACH objectid IN ARRAY idsList LOOP
INSERT INTO idsTable(original_id, new_id)
VALUES(objectid, 'GID'||nextval('mapSquema.globalid')::TEXT);
END LOOP;
ELSE
FOREACH objectid IN ARRAY idsList LOOP
INSERT INTO idsTable(original_id, new_id)
VALUES(objectid, 'ORG'||nextval('mapSquema.globalid')::TEXT);
END LOOP;
END IF;
END;
$$ LANGUAGE plpgsql;
Any ideas of what could be wrong?
edit: I haven't add the part where the idsTable is returned.

Answer 1

Unrelated, but: you don't really need a loop for that. And you can simplify the function by only writing the INSERT once. You also forgot to return something from your function. As it is declared as returns table that is required:
CREATE OR REPLACE FUNCTION createid(idslist varchar[], objecttype varchar)
RETURNS TABLE(original_id varchar, new_id varchar) as
$$
declare
l_prefix text;
BEGIN
IF LOWER(objectType) = 'global' THEN
l_prefix := 'GID';
ELSE
l_prefix := 'ORG';
END IF;
RETURN QUERY --<< return the result of the insert
INSERT INTO idstable(original_id, new_id)
select t.x, l_prefix||nextval('mapSquema.globalid')::TEXT
from unnest(idslist) as t(x)
returning *
END;
$$ LANGUAGE plpgsql;