Nested Folders: More API fixes (#59316)

* Nested Folder: Fix create, use camel case for JSON properties

* Fix get parents if the folder does not exist

* Add store test for get parents

pkg/services/folder/folderimpl/folder.go

@@ -3,6 +3,7 @@ package folderimpl
 import (
 	"context"
 	"errors"
+	"fmt"
 	"strings"
 
 	"github.com/grafana/grafana/pkg/bus"
@@ -517,7 +518,7 @@ func (s *Service) nestedFolderCreate(ctx context.Context, cmd *folder.CreateFold
 func (s *Service) validateParent(ctx context.Context, orgID int64, parentUID string) error {
 	ancestors, err := s.store.GetParents(ctx, folder.GetParentsQuery{UID: parentUID, OrgID: orgID})
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to get parents: %w", err)
 	}
 
 	if len(ancestors) == folder.MaxNestedFolderDepth {

pkg/services/folder/folderimpl/sqlstore.go

@@ -201,6 +201,13 @@ func (ss *sqlStore) GetParents(ctx context.Context, q folder.GetParentsQuery) ([
 		}
 		return nil, err
 	}
+
+	if len(folders) < 1 {
+		// the query is expected to return at least the same folder
+		// if it's empty it means that the folder does not exist
+		return nil, folder.ErrFolderNotFound
+	}
+
 	return util.Reverse(folders[1:]), nil
 }
 

pkg/services/folder/folderimpl/sqlstore_test.go

@@ -397,6 +397,11 @@ func TestIntegrationGetParents(t *testing.T) {
 		require.NoError(t, err)
 	})
 
+	t.Run("get parents of unknown folder should return an error", func(t *testing.T) {
+		_, err := folderStore.GetParents(context.Background(), folder.GetParentsQuery{})
+		require.ErrorIs(t, err, folder.ErrFolderNotFound)
+	})
+
 	t.Run("get parents of 1-st level folder should be empty", func(t *testing.T) {
 		parents, err := folderStore.GetParents(context.Background(), folder.GetParentsQuery{
 			UID:   f.UID,