From 473c1f0184df0338c3272aafe06b58d234f46211 Mon Sep 17 00:00:00 2001
From: "Paul A. Jungwirth" <pj@illuminatedcomputing.com>
Date: Thu, 1 Dec 2016 11:53:18 -0800
Subject: [PATCH] Fix race condition where two connections both try to create
 the new month's table

---
 lib/pg_audit_log/entry.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/pg_audit_log/entry.rb b/lib/pg_audit_log/entry.rb
index b36436e..f7c2b47 100644
--- a/lib/pg_audit_log/entry.rb
+++ b/lib/pg_audit_log/entry.rb
@@ -59,7 +59,11 @@ def install
             EXECUTE 'SELECT ($1 +  INTERVAL ''1 MONTH'')' INTO month_end USING month_start;
             create_table_sql :=  'CREATE TABLE ' || tablename || ' ( CHECK ( date(occurred_at) >= DATE ''' || month_start || ''' AND date(occurred_at) < DATE ''' ||
               month_end || ''' ) ) INHERITS (#{self.table_name})';
-            EXECUTE create_table_sql;
+            BEGIN
+              EXECUTE create_table_sql;
+            EXCEPTION WHEN duplicate_table THEN
+              -- do nothing
+            END;
             EXECUTE 'CREATE INDEX ' || tablename || '_occurred_at ON ' || tablename || ' (date(occurred_at))';
             EXECUTE insert_sql USING NEW;
             RETURN NULL;