Delete the mapping relationship between resources and labels when the label is deleted

src/common/dao/resource_label.go

@@ -120,3 +120,9 @@ func ListResourceLabels(query ...*models.ResourceLabelQuery) ([]*models.Resource
 	_, err := qs.All(&rls)
 	return rls, err
 }
+
+// DeleteResourceLabelByLabel delete the mapping relationship by label ID
+func DeleteResourceLabelByLabel(id int64) error {
+	_, err := GetOrmer().QueryTable(&models.ResourceLabel{}).Filter("LabelID", id).Delete()
+	return err
+}

src/common/dao/resource_label_test.go

@@ -81,4 +81,15 @@ func TestMethodsOfResourceLabel(t *testing.T) {
 	labels, err = GetLabelsOfResource(resourceType, resourceID)
 	require.Nil(t, err)
 	require.Equal(t, 0, len(labels))
+
+	// delete by label ID
+	id, err = AddResourceLabel(rl)
+	require.Nil(t, err)
+	err = DeleteResourceLabelByLabel(labelID)
+	require.Nil(t, err)
+	rls, err = ListResourceLabels(&models.ResourceLabelQuery{
+		LabelID: labelID,
+	})
+	require.Nil(t, err)
+	require.Equal(t, 0, len(rls))
 }

src/ui/api/label.go

@@ -256,6 +256,10 @@ func (l *LabelAPI) Put() {
 // Delete the label
 func (l *LabelAPI) Delete() {
 	id := l.label.ID
+	if err := dao.DeleteResourceLabelByLabel(id); err != nil {
+		l.HandleInternalServerError(fmt.Sprintf("failed to delete resource label mappings of label %d: %v", id, err))
+		return
+	}
 	if err := dao.DeleteLabel(id); err != nil {
 		l.HandleInternalServerError(fmt.Sprintf("failed to delete label %d: %v", id, err))
 		return