Merge pull request rails#49772 from fatkodima/reload-type_map-for-enums

Reload type map when creating or dropping PostgreSQL enums

Author: yahonda

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -544,7 +544,7 @@ def create_enum(name, values, **options)
           END
           $$;
         SQL
-        internal_exec_query(query)
+        internal_exec_query(query).tap { reload_type_map }
       end
 
       # Drops an enum type.
@@ -560,7 +560,7 @@ def drop_enum(name, values = nil, **options)
         query = <<~SQL
           DROP TYPE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(name)};
         SQL
-        internal_exec_query(query)
+        internal_exec_query(query).tap { reload_type_map }
       end
 
       # Rename an existing enum type to something else.

activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb

@@ -460,11 +460,18 @@ def test_raise_error_when_cannot_translate_exception
 
       def test_reload_type_map_for_newly_defined_types
         @connection.create_enum "feeling", ["good", "bad"]
-        result = @connection.select_all "SELECT 'good'::feeling"
-        assert_instance_of(PostgreSQLAdapter::OID::Enum,
-                           result.column_types["feeling"])
+
+        # Runs only SELECT, no type map reloading.
+        assert_queries(1, ignore_none: true) do
+          result = @connection.select_all "SELECT 'good'::feeling"
+          assert_instance_of(PostgreSQLAdapter::OID::Enum,
+                             result.column_types["feeling"])
+        end
       ensure
-        @connection.drop_enum "feeling", if_exists: true
+        # Reloads type map.
+        assert_sql(/from pg_type/i) do
+          @connection.drop_enum "feeling", if_exists: true
+        end
         reset_connection
       end