🐛 fix(base.py): use db_manager.engine instead of DatabaseManager.engine to access the database engine

🐛 fix(conftest.py): add TYPE_CHECKING import to fix type hinting error
🐛 fix(conftest.py): pass db_manager to blank_session_getter fixture to fix session creation error

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

@@ -70,7 +70,7 @@ class DatabaseManager(Service):
 @contextmanager
 def session_getter(db_manager: DatabaseManager):
     try:
-        session = Session(DatabaseManager.engine)
+        session = Session(db_manager.engine)
         yield session
     except Exception as e:
         print("Session rollback because of exception:", e)

tests/conftest.py

@@ -1,7 +1,7 @@
 from contextlib import contextmanager
 import json
 from pathlib import Path
-from typing import AsyncGenerator
+from typing import AsyncGenerator, TYPE_CHECKING
 from langflow.api.v1.flows import get_session
 
 from langflow.graph.graph.base import Graph
@@ -11,6 +11,9 @@ from httpx import AsyncClient
 from sqlmodel import SQLModel, Session, create_engine
 from sqlmodel.pool import StaticPool
 
+if TYPE_CHECKING:
+    from langflow.services.database.base import DatabaseManager
+
 
 def pytest_configure():
     pytest.BASIC_EXAMPLE_PATH = (
@@ -134,15 +137,15 @@ def client_fixture(session: Session):
 
 # create a fixture for session_getter above
 @pytest.fixture(name="session_getter")
-def session_getter_fixture():
+def session_getter_fixture(client):
     engine = create_engine(
         "sqlite://", connect_args={"check_same_thread": False}, poolclass=StaticPool
     )
     SQLModel.metadata.create_all(engine)
 
     @contextmanager
-    def blank_session_getter():
-        with Session(engine) as session:
+    def blank_session_getter(db_manager: "DatabaseManager"):
+        with Session(db_manager.engine) as session:
             yield session
 
     yield blank_session_getter