Fix autoincrement check, close #88

migrator.go

@@ -376,7 +376,7 @@ func (m Migrator) ColumnTypes(value interface{}) (columnTypes []gorm.ColumnType,
 			currentDatabase      = m.DB.Migrator().CurrentDatabase()
 			currentSchema, table = m.CurrentSchema(stmt, stmt.Table)
 			columns, err         = m.DB.Raw(
-				"SELECT c.column_name, c.is_nullable = 'YES', c.udt_name, c.character_maximum_length, c.numeric_precision, c.numeric_precision_radix, c.numeric_scale, c.datetime_precision, 8 * typlen, c.column_default, pd.description FROM information_schema.columns AS c JOIN pg_type AS pgt ON c.udt_name = pgt.typname LEFT JOIN pg_catalog.pg_description as pd ON pd.objsubid = c.ordinal_position AND pd.objoid = (SELECT oid FROM pg_catalog.pg_class WHERE relname = c.table_name AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = c.table_schema)) where table_catalog = ? AND table_schema = ? AND table_name = ?",
+				"SELECT c.column_name, c.is_nullable = 'YES', c.udt_name, c.character_maximum_length, c.numeric_precision, c.numeric_precision_radix, c.numeric_scale, c.datetime_precision, 8 * typlen, c.column_default, pd.description, c.identity_increment FROM information_schema.columns AS c JOIN pg_type AS pgt ON c.udt_name = pgt.typname LEFT JOIN pg_catalog.pg_description as pd ON pd.objsubid = c.ordinal_position AND pd.objoid = (SELECT oid FROM pg_catalog.pg_class WHERE relname = c.table_name AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = c.table_schema)) where table_catalog = ? AND table_schema = ? AND table_name = ?",
 				currentDatabase, currentSchema, table).Rows()
 		)
 
@@ -393,11 +393,12 @@ func (m Migrator) ColumnTypes(value interface{}) (columnTypes []gorm.ColumnType,
 				datetimePrecision sql.NullInt64
 				radixValue        sql.NullInt64
 				typeLenValue      sql.NullInt64
+				identityIncrement sql.NullString
 			)
 
 			err = columns.Scan(
 				&column.NameValue, &column.NullableValue, &column.DataTypeValue, &column.LengthValue, &column.DecimalSizeValue,
-				&radixValue, &column.ScaleValue, &datetimePrecision, &typeLenValue, &column.DefaultValueValue, &column.CommentValue,
+				&radixValue, &column.ScaleValue, &datetimePrecision, &typeLenValue, &column.DefaultValueValue, &column.CommentValue, &identityIncrement,
 			)
 			if err != nil {
 				return err
@@ -407,7 +408,8 @@ func (m Migrator) ColumnTypes(value interface{}) (columnTypes []gorm.ColumnType,
 				column.LengthValue = typeLenValue
 			}
 
-			if strings.HasPrefix(column.DefaultValueValue.String, "nextval('") && strings.HasSuffix(column.DefaultValueValue.String, "seq'::regclass)") {
+			if (strings.HasPrefix(column.DefaultValueValue.String, "nextval('") &&
+				strings.HasSuffix(column.DefaultValueValue.String, "seq'::regclass)")) || (identityIncrement.Valid && identityIncrement.String != "") {
 				column.AutoIncrementValue = sql.NullBool{Bool: true, Valid: true}
 				column.DefaultValueValue = sql.NullString{}
 			}