Create a view of locks in a postgresql database

create-lock-monitor-view.sql

CREATE VIEW lock_monitor AS(
SELECT COALESCE(blockingl.relation::regclass::text,blockingl.locktype) AS locked_item
     , now() - blockeda.query_start                                    AS waiting_duration
     , blockeda.pid                                                    AS blocked_pid
     , blockeda.query                                                  AS blocked_query
     , blockedl.mode                                                   AS blocked_mode
     , blockinga.pid                                                   AS blocking_pid
     , blockinga.query                                                 AS blocking_query
     , blockingl.mode                                                  AS blocking_mode
  FROM pg_catalog.pg_locks blockedl
  JOIN pg_stat_activity blockeda
    ON blockedl.pid = blockeda.pid
  JOIN pg_catalog.pg_locks blockingl
    ON (((       blockingl.transactionid = blockedl.transactionid)
         OR (    blockingl.relation = blockedl.relation
             AND blockingl.locktype = blockedl.locktype))
        AND blockedl.pid != blockingl.pid)
  JOIN pg_stat_activity blockinga
    ON blockingl.pid = blockinga.pid
   AND blockinga.datid = blockeda.datid
 WHERE NOT blockedl.granted
   AND blockinga.datname = current_database()
);