added min select relation field option

forms/validators/record_data.go

@@ -362,6 +362,10 @@ func (validator *RecordDataValidator) checkRelationValue(field *schema.SchemaFie
 
 	options, _ := field.Options.(*schema.RelationOptions)
 
+	if options.MinSelect != nil && len(ids) < *options.MinSelect {
+		return validation.NewError("validation_not_enough_values", fmt.Sprintf("Select at least %d", *options.MinSelect))
+	}
+
 	if options.MaxSelect != nil && len(ids) > *options.MaxSelect {
 		return validation.NewError("validation_too_many_values", fmt.Sprintf("Select no more than %d", *options.MaxSelect))
 	}

forms/validators/record_data_test.go

@@ -1212,6 +1212,7 @@ func TestRecordDataValidatorValidateRelation(t *testing.T) {
 			Unique: true,
 			Type:   schema.FieldTypeRelation,
 			Options: &schema.RelationOptions{
+				MinSelect:    types.Pointer(2),
 				CollectionId: demo.Id,
 			},
 		},
@@ -1258,6 +1259,15 @@ func TestRecordDataValidatorValidateRelation(t *testing.T) {
 			nil,
 			[]string{"field2"},
 		},
+		{
+			"check min constraint",
+			map[string]any{
+				"field2": relId2,
+				"field3": []string{relId1},
+			},
+			nil,
+			[]string{"field3"},
+		},
 		{
 			"check unique constraint",
 			map[string]any{