fix: Knowledge Base Detachment from Models

backend/open_webui/routers/knowledge.py

@@ -25,6 +25,7 @@ from open_webui.utils.access_control import has_access, has_permission
 
 
 from open_webui.env import SRC_LOG_LEVELS
+from open_webui.models.models import Models, ModelForm
 
 
 log = logging.getLogger(__name__)
@@ -473,6 +474,36 @@ async def delete_knowledge_by_id(id: str, user=Depends(get_verified_user)):
             detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
         )
 
+    log.info(f"Deleting knowledge base: {id} (name: {knowledge.name})")
+
+    # Get all models
+    models = Models.get_all_models()
+    log.info(f"Found {len(models)} models to check for knowledge base {id}")
+
+    # Update models that reference this knowledge base
+    for model in models:
+        if model.meta and hasattr(model.meta, "knowledge"):
+            knowledge_list = model.meta.knowledge or []
+            # Filter out the deleted knowledge base
+            updated_knowledge = [k for k in knowledge_list if k.get("id") != id]
+            
+            # If the knowledge list changed, update the model
+            if len(updated_knowledge) != len(knowledge_list):
+                log.info(f"Updating model {model.id} to remove knowledge base {id}")
+                model.meta.knowledge = updated_knowledge
+                # Create a ModelForm for the update
+                model_form = ModelForm(
+                    id=model.id,
+                    name=model.name,
+                    base_model_id=model.base_model_id,
+                    meta=model.meta,
+                    params=model.params,
+                    access_control=model.access_control,
+                    is_active=model.is_active
+                )
+                Models.update_model_by_id(model.id, model_form)
+
+    # Clean up vector DB
     try:
         VECTOR_DB_CLIENT.delete_collection(collection_name=id)
     except Exception as e: