fix: Update doc word count after delete chunks (#24435)

Co-authored-by: wangmuke <wangmuke@kingsware.cn>

api/services/dataset_service.py

@@ -2344,13 +2344,9 @@ class SegmentService:
 
     @classmethod
     def delete_segments(cls, segment_ids: list, document: Document, dataset: Dataset):
-        # Check if segment_ids is not empty to avoid WHERE false condition
+        segments = (
-        if not segment_ids or len(segment_ids) == 0:
+            db.session.query(DocumentSegment.index_node_id, DocumentSegment.word_count)
-            return
+            .filter(
-        index_node_ids = (
-            db.session.query(DocumentSegment)
-            .with_entities(DocumentSegment.index_node_id)
-            .where(
                 DocumentSegment.id.in_(segment_ids),
                 DocumentSegment.dataset_id == dataset.id,
                 DocumentSegment.document_id == document.id,
@@ -2358,7 +2354,15 @@ class SegmentService:
             )
             .all()
         )
-        index_node_ids = [index_node_id[0] for index_node_id in index_node_ids]
+
+        if not segments:
+            return
+
+        index_node_ids = [seg.index_node_id for seg in segments]
+        total_words = sum(seg.word_count for seg in segments)
+
+        document.word_count -= total_words
+        db.session.add(document)
 
         delete_segment_from_index_task.delay(index_node_ids, dataset.id, document.id)
         db.session.query(DocumentSegment).where(DocumentSegment.id.in_(segment_ids)).delete()