fix: [Knowledge Base] Error message when deleting a knowledge base with documents

Author: shaohuzhang1

apps/knowledge/serializers/knowledge.py

@@ -22,6 +22,7 @@
 from django.utils.translation import gettext_lazy as _
 from rest_framework import serializers
 
+from application.models import ApplicationKnowledgeMapping
 from common.config.embedding_config import VectorStore
 from common.database_model_manage.database_model_manage import DatabaseModelManage
 from common.db.search import native_search, get_dynamics_model, native_page_search
@@ -413,6 +414,7 @@ def delete(self):
             File.objects.filter(
                 source_id=knowledge.id,
             ).delete()
+            QuerySet(ApplicationKnowledgeMapping).filter(knowledge_id=knowledge.id).delete()
             QuerySet(ResourceMapping).filter(
                 Q(target_id=knowledge) | Q(source_id=knowledge)
             ).delete()