return actual error if failing to update alert data

pkg/api/dashboard.go

@@ -277,10 +277,6 @@ func PostDashboard(c *m.ReqContext, cmd m.SaveDashboardCommand) Response {
 		return Error(500, "Failed to save dashboard", err)
 	}
 
-	if err == m.ErrDashboardFailedToUpdateAlertData {
-		return Error(500, "Invalid alert data. Cannot save dashboard", err)
-	}
-
 	c.TimeRequest(metrics.M_Api_Dashboard_Save)
 	return JSON(200, util.DynMap{
 		"status":  "success",

pkg/api/dashboard_test.go

@@ -727,7 +727,6 @@ func TestDashboardApiEndpoint(t *testing.T) {
 				{SaveError: m.ErrDashboardTitleEmpty, ExpectedStatusCode: 400},
 				{SaveError: m.ErrDashboardFolderCannotHaveParent, ExpectedStatusCode: 400},
 				{SaveError: alerting.ValidationError{Reason: "Mu"}, ExpectedStatusCode: 422},
-				{SaveError: m.ErrDashboardFailedToUpdateAlertData, ExpectedStatusCode: 500},
 				{SaveError: m.ErrDashboardFailedGenerateUniqueUid, ExpectedStatusCode: 500},
 				{SaveError: m.ErrDashboardTypeMismatch, ExpectedStatusCode: 400},
 				{SaveError: m.ErrDashboardFolderWithSameNameAsDashboard, ExpectedStatusCode: 400},

pkg/models/dashboards.go

@@ -21,7 +21,6 @@ var (
 	ErrDashboardVersionMismatch                = errors.New("The dashboard has been changed by someone else")
 	ErrDashboardTitleEmpty                     = errors.New("Dashboard title cannot be empty")
 	ErrDashboardFolderCannotHaveParent         = errors.New("A Dashboard Folder cannot be added to another folder")
-	ErrDashboardFailedToUpdateAlertData        = errors.New("Failed to save alert data")
 	ErrDashboardsWithSameSlugExists            = errors.New("Multiple dashboards with the same slug exists")
 	ErrDashboardFailedGenerateUniqueUid        = errors.New("Failed to generate unique dashboard id")
 	ErrDashboardTypeMismatch                   = errors.New("Dashboard cannot be changed to a folder")

pkg/services/dashboards/dashboard_service.go

@@ -165,7 +165,7 @@ func (dr *dashboardServiceImpl) updateAlerting(cmd *models.SaveDashboardCommand,
 	}
 
 	if err := bus.Dispatch(&alertCmd); err != nil {
-		return models.ErrDashboardFailedToUpdateAlertData
+		return err
 	}
 
 	return nil