fix new team 500 (#6749)

* fix new team 500

* Update models/unit.go

Co-Authored-By: lunny <xiaolunwen@gmail.com>

models/unit.go

@@ -25,6 +25,11 @@ const (
 	UnitTypeExternalTracker                     // 7 ExternalTracker
 )
 
+// Value returns integer value for unit type
+func (u UnitType) Value() int {
+	return int(u)
+}
+
 func (u UnitType) String() string {
 	switch u {
 	case UnitTypeCode: