UBERF-8316 Documents drag and drop (#6769)

Signed-off-by: Alexander Onnikov <Alexander.Onnikov@xored.com>

plugins/document/src/utils.ts

@@ -0,0 +1,35 @@
+//
+// Copyright © 2023, 2024 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import { type DocumentQuery, type Rank, type Ref, SortingOrder, TxOperations } from '@hcengineering/core'
+
+import document from './plugin'
+import { type Document, type Teamspace } from './types'
+
+export async function getFirstRank (
+  client: TxOperations,
+  space: Ref<Teamspace>,
+  attachedTo: Ref<Document>,
+  sort: SortingOrder = SortingOrder.Descending,
+  extra: DocumentQuery<Document> = {}
+): Promise<Rank | undefined> {
+  const doc = await client.findOne(
+    document.class.Document,
+    { space, attachedTo, ...extra },
+    { sort: { rank: sort }, projection: { rank: 1 } }
+  )
+
+  return doc?.rank
+}