Goal Do not cause potentially infinite loops. Recursive rules would fire itself over and over again. Although the system is able to detect these after executing a data modification statement it is better to avoid creating these altogether.
Notes Rules are specific to PostgreSQL and thus it is not possible to get information about these from the INFORMATION_SCHEMA views. The query does not detect all possible recursions because multiple rules on different tables can also form a cycle. Different schemas could have tables with the same name. Thus, the query has to check that the table identifier is not a multipart identifier that also contains schema name.
Type Problem detection Each row in the result could represent a flaw in the design
Reliability High Few or no false-positive results
License MIT (opens in new tab)
Fixing Suggestion Drop the rule.
Data Source system catalog only
SQL Query 
WITH rules AS (SELECT n.nspname AS schemaname,
    c.relname AS tablename,
    r.rulename,
    CASE WHEN ev_type='1' THEN 'SELECT' WHEN ev_type='2' THEN 'UPDATE' WHEN ev_type='3' THEN 'INSERT' ELSE 'DELETE' END AS event,
    pg_get_ruledef(r.oid) AS definition
   FROM pg_rewrite r
     JOIN pg_class c ON c.oid = r.ev_class
     JOIN pg_namespace n ON n.oid = c.relnamespace
     JOIN pg_authid u ON  n.nspowner = u.oid
  WHERE r.rulename <> '_RETURN' AND
(n.nspname = 'public' OR u.rolname <> 'postgres')) 
SELECT schemaname, tablename, rulename, event, definition
FROM rules
WHERE definition ILIKE '% DO %' || event || '%' || tablename || '%'
AND definition NOT ILIKE '% DO %' || event || '%' || '.' || tablename || '%'
ORDER BY schemaname, tablename, rulename, event;

SQL statements that help generate fixes for the identified problem.

Fix Action #1
 WITH rules AS (SELECT n.nspname AS schemaname,
    c.relname AS tablename,
    r.rulename,
    CASE WHEN ev_type='1' THEN 'SELECT' WHEN ev_type='2' THEN 'UPDATE' WHEN ev_type='3' THEN 'INSERT' ELSE 'DELETE' END AS event,
    pg_get_ruledef(r.oid) AS definition
   FROM pg_rewrite r
     JOIN pg_class c ON c.oid = r.ev_class
     JOIN pg_namespace n ON n.oid = c.relnamespace
     JOIN pg_authid u ON  n.nspowner = u.oid
  WHERE r.rulename <> '_RETURN' AND
(n.nspname = 'public' OR u.rolname <> 'postgres')) 
SELECT format('DROP RULE %1$I ON %2$I.%3$I', rulename, schemaname, tablename) AS statements
FROM rules
WHERE definition ILIKE '% DO %' || event || '%' || tablename || '%'
AND definition NOT ILIKE '% DO %' || event || '%' || '.' || tablename || '%'
ORDER BY schemaname, tablename, rulename, event;

Drop the rule.

SQL Query to Generate FixDescription
 WITH rules AS (SELECT n.nspname AS schemaname,
    c.relname AS tablename,
    r.rulename,
    CASE WHEN ev_type='1' THEN 'SELECT' WHEN ev_type='2' THEN 'UPDATE' WHEN ev_type='3' THEN 'INSERT' ELSE 'DELETE' END AS event,
    pg_get_ruledef(r.oid) AS definition
   FROM pg_rewrite r
     JOIN pg_class c ON c.oid = r.ev_class
     JOIN pg_namespace n ON n.oid = c.relnamespace
     JOIN pg_authid u ON  n.nspowner = u.oid
  WHERE r.rulename <> '_RETURN' AND
(n.nspname = 'public' OR u.rolname <> 'postgres')) 
SELECT format('DROP RULE %1$I ON %2$I.%3$I', rulename, schemaname, tablename) AS statements
FROM rules
WHERE definition ILIKE '% DO %' || event || '%' || tablename || '%'
AND definition NOT ILIKE '% DO %' || event || '%' || '.' || tablename || '%'
ORDER BY schemaname, tablename, rulename, event;
Drop the rule.

Collections

This query belongs to the following collections:

Find problems automatically

Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Categories

This query is classified under the following categories:

Triggers and rules

Queries of this category provide information about triggers and rules in a database.

NameDescription
Triggers and rulesQueries of this category provide information about triggers and rules in a database.