from pycen import con
# import pycen

s1 = '''create trigger get_communnes_intersects after
insert
    or
delete
    or
update
    on
    sites.r_sites_geom for each row execute function sites.refresh_site_comm()'''

s2 = '''CREATE OR REPLACE FUNCTION sites.refresh_site_comm()
 RETURNS trigger
 LANGUAGE plpgsql
AS $function$
    BEGIN
    with t1 as (
        SELECT 
        id,
        nom_com,
        insee_com,
        geom
        FROM flux_geo.vm_communes_isere
    ),
    t2 as (SELECT
        s.id_site,
        json_object_agg(t1.insee_com,t1.nom_com) all_comm,
        max(s.date) date,
        s.geom
        -- FROM s1 s, t1
        FROM sites.r_sites_geom s, t1
        WHERE st_intersects(s.geom,t1.geom) 
        and s.id_site = NEW.id_site
        GROUP BY s.id_site,s.geom,s.date
        ORDER BY s.id_site, s.date DESC)
    UPDATE sites.sites SET nom_com_json = t2.all_comm 
        FROM t2
        WHERE id = t2.id_site;
        IF NOT FOUND THEN 
            UPDATE sites.sites SET nom_com = null WHERE id = t2.id_site; 
        END IF;
    RETURN NEW;
    END;
$function$
;'''
with con.begin() as cnx:
    cnx.execute(s1)
    cnx.execute(s2)