Loop custom type object ion procedure

I created the following type:

    CREATE OR REPLACE EDITIONABLE TYPE  "MY_CUSTOM_TYPE" AS OBJECT (
      my_num      NUMBER,
      my_char    VARCHAR2(3000)
    )

Inside of a procedure then I accept this parameter and want to loop through it:

create or replace PROCEDURE my_proc(
P_MY_TYPE IN MY_CUSTOM_TYPE
)
BEGIN

  FOR i IN P_MY_TYPE.FIRST .. P_MY_TYPE.LAST
  LOOP
  dbms_output.put_line( P_MY_TYPE(i).my_num || ' ' ||  P_MY_TYPE(i).my_char);
  END LOOP;

END;

I keep getting this error though:

PLS-00302: component 'FIRST' must be declared

Answer

It is possible that you want to create a collection type

create type my_custom_collection
    as table of my_custom_type;

and then pass that collection to your procedure

create or replace procedure my_proc(
  p_collection my_custom_collection
)
as
begin
  for i in 1..p_collection.count
  loop
    dbms_output.put_line( p_collection(i).my_num || ' ' ||
                          p_collection(i).my_char );
  end loop;
end my_proc;

If that is not what you are looking for, please edit your question to explain what exactly you are trying to loop over. An object type is a scalar so it doesn’t make sense to try to call first or last on it or to try to access the i^th element.