1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
index e399b6e499..da8d0c6992 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
@@ -77,6 +77,9 @@ module ActiveRecord
         end
 
         private
+          def lookup_cast_type(sql_type)
+            super(select_value("SELECT #{quote(sql_type)}::regtype::oid", "SCHEMA").to_i)
+          end
 
           def _quote(value)
             case value