Fix unique validator for map with Pointer value (#1062)

baked_in.go

@@ -315,11 +315,17 @@ func isUnique(fl FieldLevel) bool {
 		}
 		return field.Len() == m.Len()
 	case reflect.Map:
-		m := reflect.MakeMap(reflect.MapOf(field.Type().Elem(), v.Type()))
+		var m reflect.Value
+		if field.Type().Elem().Kind() == reflect.Ptr {
+			m = reflect.MakeMap(reflect.MapOf(field.Type().Elem().Elem(), v.Type()))
+		} else {
+			m = reflect.MakeMap(reflect.MapOf(field.Type().Elem(), v.Type()))
+		}
 
 		for _, k := range field.MapKeys() {
-			m.SetMapIndex(field.MapIndex(k), v)
+			m.SetMapIndex(reflect.Indirect(field.MapIndex(k)), v)
 		}
+
 		return field.Len() == m.Len()
 	default:
 		panic(fmt.Sprintf("Bad field type %T", field.Interface()))

validator_test.go

@@ -9890,6 +9890,12 @@ func TestUniqueValidation(t *testing.T) {
 		{map[string]string{"one": "a", "two": "a"}, false},
 		{map[string]interface{}{"one": "a", "two": "a"}, false},
 		{map[string]interface{}{"one": "a", "two": 1, "three": "b", "four": 1}, false},
+		{map[string]*string{"one": stringPtr("a"), "two": stringPtr("a")}, false},
+		{map[string]*string{"one": stringPtr("a"), "two": stringPtr("b")}, true},
+		{map[string]*int{"one": intPtr(1), "two": intPtr(1)}, false},
+		{map[string]*int{"one": intPtr(1), "two": intPtr(2)}, true},
+		{map[string]*float64{"one": float64Ptr(1.1), "two": float64Ptr(1.1)}, false},
+		{map[string]*float64{"one": float64Ptr(1.1), "two": float64Ptr(1.2)}, true},
 	}
 
 	validate := New()