IndexError: tuple index out of range when using db.execute_sql

I have function to create on PostgreSQL:

jsonb_flatten_function = """
create or replace function create_jsonb_flat_view
    (view_name text, table_name text, regular_columns text, json_column text)
    returns text language plpgsql as $$
declare
    cols text;
begin
    execute format ($ex$
        select string_agg(format('%2$s->>%%1$L "%2$s.%%1$s"', key), ', ')
        from (
            select distinct key
            from %1$s, jsonb_each(%2$s)
            order by 1
            ) s;
        $ex$, table_name, json_column)
    into cols;
    execute format($ex$
        drop view if exists %1$s;
        create view %1$s as 
        select %3$s, %4$s from %2$s
        $ex$, view_name, table_name, regular_columns, cols);
    return cols;
end $$;
"""

If try to execute the previous sql with

db.execute_sql(jsonb_flatten_function)

it raises

Traceback (most recent call last):
  File "/home/user/init_pg.py", line 91, in <module>
    db.execute_sql(jsonb_flatten_function)
  File "/home/user/mainenv/lib/python3.6/site-packages/peewee.py", line 2940, in execute_sql
    cursor.execute(sql, params or ())
IndexError: tuple index out of range

However if I use a psycopg2 curosr manually or use:

cursor = db.cursor()
cursor.execute(jsonb_flatten_function)

It works without any issue.

Removing or () from cursor.execute(sql, params or ()) seems to fix it, I’m not sure why it exists in the first place though.

[TimothyBramlett]

@coleifer @ymrzkrrs Nevermind, simply included an extra % to escape the %:

and ((id %% 2)) = 0)

[TimothyBramlett]

@ymrzkrrs Did you ever solve this issue?