diff --git a/orm/models_info_f.go b/orm/models_info_f.go
index 33db0d4f..ba25f744 100644
--- a/orm/models_info_f.go
+++ b/orm/models_info_f.go
@@ -143,7 +143,7 @@ func newFieldInfo(mi *modelInfo, field reflect.Value, sf reflect.StructField, mN
 	var (
 		tag       string
 		tagValue  string
-		initial   StrTo
+		initial   StrTo // store the default value
 		fieldType int
 		attrs     map[string]bool
 		tags      map[string]string
@@ -215,7 +215,7 @@ checkType:
 				}
 				break checkType
 			default:
-				err = fmt.Errorf("error")
+				err = fmt.Errorf("rel only allow these value: fk, one, m2m")
 				goto wrongTag
 			}
 		}
@@ -235,7 +235,7 @@ checkType:
 				}
 				break checkType
 			default:
-				err = fmt.Errorf("error")
+				err = fmt.Errorf("reverse only allow these value: one, many")
 				goto wrongTag
 			}
 		}
diff --git a/orm/models_utils.go b/orm/models_utils.go
index 2a1f9d53..44a0e76a 100644
--- a/orm/models_utils.go
+++ b/orm/models_utils.go
@@ -70,11 +70,8 @@ func getTableEngine(val reflect.Value) string {
 	fun := val.MethodByName("TableEngine")
 	if fun.IsValid() {
 		vals := fun.Call([]reflect.Value{})
-		if len(vals) > 0 {
-			val := vals[0]
-			if val.Kind() == reflect.String {
-				return val.String()
-			}
+		if len(vals) > 0 && vals[0].Kind() == reflect.String {
+			return vals[0].String()
 		}
 	}
 	return ""
@@ -85,12 +82,9 @@ func getTableIndex(val reflect.Value) [][]string {
 	fun := val.MethodByName("TableIndex")
 	if fun.IsValid() {
 		vals := fun.Call([]reflect.Value{})
-		if len(vals) > 0 {
-			val := vals[0]
-			if val.CanInterface() {
-				if d, ok := val.Interface().([][]string); ok {
-					return d
-				}
+		if len(vals) > 0 && vals[0].CanInterface() {
+			if d, ok := vals[0].Interface().([][]string); ok {
+				return d
 			}
 		}
 	}
@@ -102,12 +96,9 @@ func getTableUnique(val reflect.Value) [][]string {
 	fun := val.MethodByName("TableUnique")
 	if fun.IsValid() {
 		vals := fun.Call([]reflect.Value{})
-		if len(vals) > 0 {
-			val := vals[0]
-			if val.CanInterface() {
-				if d, ok := val.Interface().([][]string); ok {
-					return d
-				}
+		if len(vals) > 0 && vals[0].CanInterface() {
+			if d, ok := vals[0].Interface().([][]string); ok {
+				return d
 			}
 		}
 	}