fix: Implement get_or_create_default_folder for user folder management (#6090)

* feat: implement get_or_create_default_folder function to ensure default folder exists for users

* refactor: replace create_default_folder_if_it_doesnt_exist with get_or_create_default_folder for user folder creation

* test: add unit tests for get_or_create_default_folder function

* ✨ (generalBugs-shard-10.spec.ts): refactor test script to improve readability and maintainability by chaining actions on page elements instead of using separate lines for each action

---------

Co-authored-by: cristhianzl <cristhian.lousa@gmail.com>

src/backend/base/langflow/__main__.py

@@ -25,9 +25,9 @@ from rich.panel import Panel
 from rich.table import Table
 from sqlmodel import select
 
+from langflow.initial_setup.setup import get_or_create_default_folder
 from langflow.logging.logger import configure, logger
 from langflow.main import setup_app
-from langflow.services.database.models.folder.utils import create_default_folder_if_it_doesnt_exist
 from langflow.services.database.utils import session_getter
 from langflow.services.deps import get_db_service, get_settings_service, session_scope
 from langflow.services.settings.constants import DEFAULT_SUPERUSER
@@ -464,7 +464,7 @@ def superuser(
                     typer.echo("Superuser creation failed.")
                     return
                 # Now create the first folder for the user
-                result = await create_default_folder_if_it_doesnt_exist(session, user.id)
+                result = await get_or_create_default_folder(session, user.id)
                 if result:
                     typer.echo("Default folder created successfully.")
                 else:

src/backend/base/langflow/api/v1/login.py

@@ -7,13 +7,13 @@ from fastapi.security import OAuth2PasswordRequestForm
 
 from langflow.api.utils import DbSession
 from langflow.api.v1.schemas import Token
+from langflow.initial_setup.setup import get_or_create_default_folder
 from langflow.services.auth.utils import (
     authenticate_user,
     create_refresh_token,
     create_user_longterm_token,
     create_user_tokens,
 )
-from langflow.services.database.models.folder.utils import create_default_folder_if_it_doesnt_exist
 from langflow.services.database.models.user.crud import get_user_by_id
 from langflow.services.deps import get_settings_service, get_variable_service
 
@@ -68,7 +68,7 @@ async def login_to_get_access_token(
         )
         await get_variable_service().initialize_user_variables(user.id, db)
         # Create default folder for user if it doesn't exist
-        await create_default_folder_if_it_doesnt_exist(db, user.id)
+        _ = await get_or_create_default_folder(db, user.id)
         return tokens
     raise HTTPException(
         status_code=status.HTTP_401_UNAUTHORIZED,

src/backend/base/langflow/api/v1/users.py

@@ -9,12 +9,12 @@ from sqlmodel.sql.expression import SelectOfScalar
 
 from langflow.api.utils import CurrentActiveUser, DbSession
 from langflow.api.v1.schemas import UsersResponse
+from langflow.initial_setup.setup import get_or_create_default_folder
 from langflow.services.auth.utils import (
     get_current_active_superuser,
     get_password_hash,
     verify_password,
 )
-from langflow.services.database.models.folder.utils import create_default_folder_if_it_doesnt_exist
 from langflow.services.database.models.user import User, UserCreate, UserRead, UserUpdate
 from langflow.services.database.models.user.crud import get_user_by_id, update_user
 from langflow.services.deps import get_settings_service
@@ -35,7 +35,7 @@ async def add_user(
         session.add(new_user)
         await session.commit()
         await session.refresh(new_user)
-        folder = await create_default_folder_if_it_doesnt_exist(session, new_user.id)
+        folder = await get_or_create_default_folder(session, new_user.id)
         if not folder:
             raise HTTPException(status_code=500, detail="Error creating default folder")
     except IntegrityError as e:

src/backend/base/langflow/initial_setup/setup.py

@@ -17,6 +17,7 @@ from uuid import UUID
 import anyio
 import httpx
 import orjson
+import sqlalchemy as sa
 from aiofile import async_open
 from emoji import demojize, purely_emoji
 from loguru import logger
@@ -29,11 +30,8 @@ from langflow.base.constants import FIELD_FORMAT_ATTRIBUTES, NODE_FORMAT_ATTRIBU
 from langflow.initial_setup.constants import STARTER_FOLDER_DESCRIPTION, STARTER_FOLDER_NAME
 from langflow.services.auth.utils import create_super_user
 from langflow.services.database.models.flow.model import Flow, FlowCreate
-from langflow.services.database.models.folder.model import Folder, FolderCreate
-from langflow.services.database.models.folder.utils import (
-    create_default_folder_if_it_doesnt_exist,
-    get_default_folder_id,
-)
+from langflow.services.database.models.folder.constants import DEFAULT_FOLDER_NAME
+from langflow.services.database.models.folder.model import Folder, FolderCreate, FolderRead
 from langflow.services.database.models.user.crud import get_user_by_username
 from langflow.services.deps import get_settings_service, get_storage_service, get_variable_service, session_scope
 from langflow.template.field.prompt import DEFAULT_PROMPT_INTUT_TYPES
@@ -595,6 +593,10 @@ async def load_flows_from_directory() -> None:
         if user is None:
             msg = "Superuser not found in the database"
             raise NoResultFound(msg)
+
+        # Ensure that the default folder exists for this user
+        _ = await get_or_create_default_folder(session, user.id)
+
         async for file_path in anyio.Path(flows_path).iterdir():
             if not await file_path.is_file() or file_path.suffix != ".json":
                 continue
@@ -707,11 +709,9 @@ async def upsert_flow_from_file(file_content: AnyStr, filename: str, session: As
         existing.updated_at = datetime.now(tz=timezone.utc).astimezone()
         existing.user_id = user_id
 
-        # Generally, folder_id should not be None, but we must check this due to the previous
-        # behavior where flows could be added and folder_id was None, orphaning
-        # them within Langflow.
+        # Ensure that the flow is associated with an existing default folder
         if existing.folder_id is None:
-            folder_id = await get_default_folder_id(session, user_id)
+            folder_id = await get_or_create_default_folder(session, user_id)
             existing.folder_id = folder_id
 
         if isinstance(existing.id, str):
@@ -725,11 +725,11 @@ async def upsert_flow_from_file(file_content: AnyStr, filename: str, session: As
     else:
         logger.info(f"Creating new flow: {flow_id} with endpoint name {flow_endpoint_name}")
 
-        # Current behavior loads all new flows into default folder
-        folder_id = await get_default_folder_id(session, user_id)
+        # Assign the newly created flow to the default folder
+        folder = await get_or_create_default_folder(session, user_id)
         flow["user_id"] = user_id
-        flow["folder_id"] = folder_id
-        flow = Flow.model_validate(flow, from_attributes=True)
+        flow["folder_id"] = folder.id
+        flow = Flow.model_validate(flow)
         flow.updated_at = datetime.now(tz=timezone.utc).astimezone()
 
         session.add(flow)
@@ -816,5 +816,42 @@ async def initialize_super_user_if_needed() -> None:
     async with session_scope() as async_session:
         super_user = await create_super_user(db=async_session, username=username, password=password)
         await get_variable_service().initialize_user_variables(super_user.id, async_session)
-        await create_default_folder_if_it_doesnt_exist(async_session, super_user.id)
+        _ = await get_or_create_default_folder(async_session, super_user.id)
     logger.info("Super user initialized")
+
+
+async def get_or_create_default_folder(session: AsyncSession, user_id: UUID) -> FolderRead:
+    """Ensure the default folder exists for the given user_id. If it doesn't exist, create it.
+
+    Uses an idempotent insertion approach to handle concurrent creation gracefully.
+
+    This implementation avoids an external distributed lock and works with both SQLite and PostgreSQL.
+
+    Args:
+        session (AsyncSession): The active database session.
+        user_id (UUID): The ID of the user who owns the folder.
+
+    Returns:
+        UUID: The ID of the default folder.
+    """
+    stmt = select(Folder).where(Folder.user_id == user_id, Folder.name == DEFAULT_FOLDER_NAME)
+    result = await session.exec(stmt)
+    folder = result.first()
+    if folder:
+        return FolderRead.model_validate(folder, from_attributes=True)
+
+    try:
+        folder_obj = Folder(user_id=user_id, name=DEFAULT_FOLDER_NAME)
+        session.add(folder_obj)
+        await session.commit()
+        await session.refresh(folder_obj)
+    except sa.exc.IntegrityError as e:
+        # Another worker may have created the folder concurrently.
+        await session.rollback()
+        result = await session.exec(stmt)
+        folder = result.first()
+        if folder:
+            return FolderRead.model_validate(folder, from_attributes=True)
+        msg = "Failed to get or create default folder"
+        raise ValueError(msg) from e
+    return FolderRead.model_validate(folder_obj, from_attributes=True)

src/backend/base/langflow/services/database/models/folder/utils.py

@@ -3,6 +3,7 @@ from uuid import UUID
 from sqlmodel import and_, select, update
 from sqlmodel.ext.asyncio.session import AsyncSession
 
+from langflow.initial_setup.setup import get_or_create_default_folder
 from langflow.services.database.models.flow.model import Flow
 
 from .constants import DEFAULT_FOLDER_DESCRIPTION, DEFAULT_FOLDER_NAME
@@ -40,5 +41,5 @@ async def get_default_folder_id(session: AsyncSession, user_id: UUID):
         await session.exec(select(Folder).where(Folder.name == DEFAULT_FOLDER_NAME, Folder.user_id == user_id))
     ).first()
     if not folder:
-        folder = await create_default_folder_if_it_doesnt_exist(session, user_id)
+        folder = await get_or_create_default_folder(session, user_id)
     return folder.id

src/backend/tests/unit/initial_setup/test_setup_functions.py

@@ -0,0 +1,52 @@
+import asyncio
+from uuid import uuid4
+
+import pytest
+from langflow.initial_setup.setup import DEFAULT_FOLDER_NAME, get_or_create_default_folder, session_scope
+from langflow.services.database.models.folder.model import FolderRead
+
+
+@pytest.mark.usefixtures("client")
+async def test_get_or_create_default_folder_creation() -> None:
+    """Test that a default folder is created for a new user.
+
+    This test verifies that when no default folder exists for a given user,
+    get_or_create_default_folder creates one with the expected name and assigns it an ID.
+    """
+    test_user_id = uuid4()
+    async with session_scope() as session:
+        folder = await get_or_create_default_folder(session, test_user_id)
+        assert folder.name == DEFAULT_FOLDER_NAME, "The folder name should match the default."
+        assert hasattr(folder, "id"), "The folder should have an 'id' attribute after creation."
+
+
+@pytest.mark.usefixtures("client")
+async def test_get_or_create_default_folder_idempotency() -> None:
+    """Test that subsequent calls to get_or_create_default_folder return the same folder.
+
+    The function should be idempotent such that if a default folder already exists,
+    calling the function again does not create a new one.
+    """
+    test_user_id = uuid4()
+    async with session_scope() as session:
+        folder_first = await get_or_create_default_folder(session, test_user_id)
+        folder_second = await get_or_create_default_folder(session, test_user_id)
+        assert folder_first.id == folder_second.id, "Both calls should return the same folder instance."
+
+
+@pytest.mark.usefixtures("client")
+async def test_get_or_create_default_folder_concurrent_calls() -> None:
+    """Test concurrent invocations of get_or_create_default_folder.
+
+    This test ensures that when multiple concurrent calls are made for the same user,
+    only one default folder is created, demonstrating idempotency under concurrent access.
+    """
+    test_user_id = uuid4()
+
+    async def get_folder() -> FolderRead:
+        async with session_scope() as session:
+            return await get_or_create_default_folder(session, test_user_id)
+
+    results = await asyncio.gather(get_folder(), get_folder(), get_folder())
+    folder_ids = {folder.id for folder in results}
+    assert len(folder_ids) == 1, "Concurrent calls must return a single, consistent folder instance."

src/frontend/tests/extended/regression/generalBugs-shard-10.spec.ts

@@ -34,21 +34,15 @@ test(
 
     //connection 1
 
-    const elementPrompt = await page
+    await page
       .getByTestId("handle-prompt-shownode-prompt message-right")
-      .first();
-    await elementPrompt.hover();
-    await page.mouse.down();
+      .first()
+      .click();
 
-    await page.locator('//*[@id="react-flow-id"]').hover();
-
-    const elementChatOutput = await page
+    await page
       .getByTestId("handle-chatoutput-shownode-text-left")
-      .first();
-    await elementChatOutput.hover();
-    await page.mouse.up();
-
-    await page.locator('//*[@id="react-flow-id"]').hover();
+      .first()
+      .click();
 
     await page.getByTestId("button_open_prompt_modal").click();
 
@@ -70,7 +64,7 @@ test(
 
     await page.getByText("Close").last().click();
 
-    await page.getByText("Prompt", { exact: true }).click();
+    await page.getByText("Prompt", { exact: true }).last().click();
 
     await page.getByTestId("more-options-modal").click();
 
@@ -80,8 +74,6 @@ test(
 
     expect(page.locator(".border-ring-frozen")).toHaveCount(1);
 
-    await page.locator('//*[@id="react-flow-id"]').click();
-
     await page.getByTestId("button_open_prompt_modal").click();
 
     await page.getByTestId("edit-prompt-sanitized").first().click();