🐛 fix(custom_component.py): import get_db_manager function from langflow.services.utils to fix NameError

🐛 fix(factory.py): raise ValueError if no database URL provided in settings
🐛 fix(manager.py): change return type annotation of load_settings_from_yaml method to "SettingsManager" instead of "Settings"
🐛 fix(utils.py): import service_manager and ServiceType to fix NameError

src/backend/langflow/interface/custom/custom_component.py

@@ -3,6 +3,7 @@ from fastapi import HTTPException
 from langflow.interface.custom.constants import CUSTOM_COMPONENT_SUPPORTED_TYPES
 from langflow.interface.custom.component import Component
 from langflow.interface.custom.directory_reader import DirectoryReader
+from langflow.services.utils import get_db_manager
 
 from langflow.utils import validate
 
@@ -159,7 +160,8 @@ class CustomComponent(Component, extra=Extra.allow):
         from langflow.processing.process import build_sorted_vertices_with_caching
         from langflow.processing.process import process_tweaks
 
-        with session_getter() as session:
+        db_manager = get_db_manager()
+        with session_getter(db_manager) as session:
             graph_data = flow.data if (flow := session.get(Flow, flow_id)) else None
         if not graph_data:
             raise ValueError(f"Flow {flow_id} not found")
@@ -169,7 +171,8 @@ class CustomComponent(Component, extra=Extra.allow):
 
     def list_flows(self, *, get_session: Optional[Callable] = None) -> List[Flow]:
         get_session = get_session or session_getter
-        with get_session() as session:
+        db_manager = get_db_manager()
+        with get_session(db_manager) as session:
             flows = session.query(Flow).all()
         return flows
 
@@ -182,8 +185,8 @@ class CustomComponent(Component, extra=Extra.allow):
         get_session: Optional[Callable] = None,
     ) -> Flow:
         get_session = get_session or session_getter
-
-        with get_session() as session:
+        db_manager = get_db_manager()
+        with get_session(db_manager) as session:
             if flow_id:
                 flow = session.query(Flow).get(flow_id)
             elif flow_name:

src/backend/langflow/services/database/factory.py

@@ -12,4 +12,6 @@ class DatabaseManagerFactory(ServiceFactory):
 
     def create(self, settings_service: "SettingsManager"):
         # Here you would have logic to create and configure a DatabaseManager
+        if not settings_service.settings.DATABASE_URL:
+            raise ValueError("No database URL provided")
         return DatabaseManager(settings_service.settings.DATABASE_URL)

src/backend/langflow/services/settings/manager.py

@@ -13,7 +13,7 @@ class SettingsManager(Service):
         self.settings = settings
 
     @classmethod
-    def load_settings_from_yaml(cls, file_path: str) -> Settings:
+    def load_settings_from_yaml(cls, file_path: str) -> "SettingsManager":
         # Check if a string is a valid path or a file name
         if "/" not in file_path:
             # Get current path

src/backend/langflow/services/utils.py

@@ -9,6 +9,10 @@ def get_settings_manager() -> "SettingsManager":
     return service_manager.get(ServiceType.SETTINGS_MANAGER)
 
 
+def get_db_manager():
+    return service_manager.get(ServiceType.DATABASE_MANAGER)
+
+
 def get_session():
     db_manager = service_manager.get(ServiceType.DATABASE_MANAGER)
     yield from db_manager.get_session()