Telegram-канал python - Python: Unsorted - каталог телеграмм

Python

29 August 2026 23:12

It would be really nice if you would open an issue on Github (or two) stating all of these bugs you found / think you found.
So when i fix them, you get credited.

Its very easy to do. Just follow the first example in this document
https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/creating-an-issue#creating-an-issue-from-a-repository

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Python

29 August 2026 22:53

Generators do not work yet
I though we established that

And if you knew what generator is, you would knew that you can call next() on it to produce a value
vivekvjnk/understanding-python-generators-the-power-of-yield-and-state-management-382faa48e761" rel="nofollow">https://medium.com/@vivekvjnk/understanding-python-generators-the-power-of-yield-and-state-management-382faa48e761

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Python

29 August 2026 22:50

see as you say i found and started using this library, lastly all before thigns works, but it got stuck when i use the di to do real database crud operation, there it say, but still i found the a fun whihc do :
yield session, this function not yeield the session but it return a generator, and thats why i cannot perform any crud functions there, i will try to raise one issue in the repository with all the things,

def get_session() -> Generator[Session, None, None]:
    with Session(engine) as session:
        yield session

but i found my code fails at this line,
results = self._session.exec(statement)
by saying
AttributeError: 'generator' object has no attribute 'exec'
i spend all the day and night not solving any solutions, as you say this will works like same as fastapi yield also, but it not works, what can i have to do, i integrate this library but lastly this one problem is not solvable, 😢
it so painful, what can be the solvable solution for this?

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Python

29 August 2026 21:56

as you say to impliment like for my use case i found this is working,

@login_manager.user_loader
def load_user(
    user_id: str,
) -> FlaskLoginUser | None:

    from flask_di import Depends

    user_repository: UserRepository = current_app._resolve_dependency(
        Depends(user_repository_provider)
    )

    obj_domain = user_repository.get_by_id(user_id)

    if obj_domain is None:
        return None

    obj = FlaskLoginUser(obj_domain)
        return obj

i found maybe this is working, but i have a problem maybe:
see is this any problem,
first of all as from flask import current_app does not know about the _resolve_dependency, so any easy way it will shows current_app._resolve_dependency with type sugerssion in the vs code?
2nd ly is a problem see when i do 'user_repository: UserRepository' still as the current_app dont know about this return type it still say user_repository is a UserRepository | Unknown

Thats why it cannot be solved easily, how i can solve this, can you solve by chaning somethign in ur library, or i need to do how in my code?

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Python

29 August 2026 21:05

i wish i could do this type of things like other do.
i am really learning more about di and so on and then come back with you

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Python

29 August 2026 20:58

But it is
Flasks request is in both of these, it should work fine

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Python

29 August 2026 20:42

so in your library if i will use, the ._resolve_dependency() this will call any Depends, if i have

SessionDep = Annotated[...]

will this also work, is htis means, even fun is not part of the current response-request thsi dependency will work always?

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Python

29 August 2026 20:36

and see i listen that this your library will not work with yield, as when i getting explanation of this library in some library with my little code i got to know, as i am not understand very very python concept i got to know like this,

Below Response from ai: was this how right can you check ur code:

There is one important issue here, though.
Your DIFlask implementation does:

value = dep_func(**kwargs)

It does not understand generator dependencies.
So if get_session() literally contains:

yield session

then calling:

get_session()

returns a:

Generator

not a Session.
⚠️ This is an important limitation/bug in the di-flask implementation you showed me.
FastAPI understands generator dependencies and performs cleanup.
This small library does not.

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Python

29 August 2026 20:33

For now, you can
I will implement a public one soon, so it will be just

db = current_app.resolve(get_db)

For now use the private method

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Python

29 August 2026 20:31

will i call like this private methods in my application?

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Python

29 August 2026 20:23

as thsi is not coming from response fun, so the user_repository:UserRepositoryDep will not resolve right?
see the message of this

i did integrate your library with many codes dependency, now i am not able actually to resolve this as my app just stop at this user_loader in open

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Python

29 August 2026 20:21

i make like this,

def create_app() -> Flask:
# app = Flask(
# import_name=__name__,
# )

app = DIFlask(
import_name=__name__,
)

login_manager.init_app( # type: ignore
app=app,
)
csrf.init_app( # type: ignore
app=app,
)
app.secret_key = settings.app.secret_key.get_secret_value()

app.register_blueprint(blueprint=auth_bp)
app.register_blueprint(blueprint=general_bp)

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Python

29 August 2026 20:00

I have this big issue, why this not shows how i can use factory pattern here easily, as per the docs,
app = DIFlask(name)

But see, for another case we use,

def create_app() -> Flask:
    app = Flask(
        import_name=__name__,
    )

    login_manager.init_app( # type: ignore
        app=app,
    )
    csrf.init_app( # type: ignore
        app=app,
    )
    di_flask = DIFlask()

    di_flask.init_app( #This is not working why???
        app=app,
)

    app.secret_key = settings.app.secret_key.get_secret_value()

    app.register_blueprint(blueprint=auth_bp)
    app.register_blueprint(blueprint=general_bp)
    return app

Where is the way i will integrate this library, as the docs say this is really differnet using the (__name) but will this upper , di_flask.init__app will i need or not if then how i will add, as this is a flask_realated library but it not working to integrate so how i will use ?

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Python

29 August 2026 19:17

My app workflow:

register route
     │
     ▼
RegistrationServiceDep
     │
     ▼
get_registration_service()
     │
     ▼
UserRepositoryDep
     │
     ▼
get_sqlmodel_repository()
     │
     ▼
SessionDep
     │
     ▼
get_session()

why you write like this why not

def get_session() -> Generator[Session, None, None]:
    with Session(engine) as session:
        yield session

will it work or not, as i have not any get_db function?

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Python

29 August 2026 20:29

This is actually something i may need to add to library

You can use this example as a workaround until i implement a public method for this specific usecase (and others flask may need)

from flask import current_app
from flask_login import LoginManager
from flask_di import Depends

login_manager = LoginManager()

def get_db():
    return SessionLocal()

@login_manager.user_loader
def load_user(user_id):
    db = current_app._resolve_dependency(Depends(get_db))
    return db.get(User, int(user_id))

Just implement it for your usecase

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Python

29 August 2026 20:23

the problem is
@login_manager.user_loader

here i cann't able to pass the Annotated's Depends from your library, as how this will resolve the Dependency?


@login_manager.user_loader 
def load_user(
    user_id: str,
    user_repository: UserRepositoryDep,
) -> FlaskLoginUser | None:
    obj_entity = user_repository.get_by_id(
        user_id=user_id,
    )

    if obj_entity is None:
        return None

    return FlaskLoginUser(obj_entity)

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Python

29 August 2026 20:19

What part of

For automatic injection of dependecies we need to wrap Flask class

You dont understand?

Instead of importing flask you import DIFlask and use that as your flask app

from flask_di import DIFlask

app = DIFlask(__name__)

Copied from the docs 🤷‍♂

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Python

29 August 2026 19:46

i also want to for checking i used this type of code, but the problem is the dependency will how work in this user_loader callback


@login_manager.user_loader # type: ignore
def load_user(
    user_id: str,
    user_repository: UserRepositoryDep,
) -> FlaskLoginUser | None:
"""
https://flask-login.readthedocs.io/en/latest/#how-it-works
As per the docs it should return the obj or the None.

This will read the user_id from the cookie and convert into the user obj
from the user_obj i will get differnt data to use.
"""
obj_entity = user_repository.get_by_id(
    user_id=user_id,
)

if obj_entity is None:
    return None

return FlaskLoginUser(obj_entity)

the problem i found by other ai places also say here di will not work as user_loader decorator will not see the 2nd parameter of the Dep so it will not call, i tried a lot of ask to there but still this is not found any solution.

My main problem is when i am using session: by external dependency.py this got confused, else if i will use single session across my app all is become so easy to write my code

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Python

29 August 2026 19:13

Hello i have started to explore the di and so on and then integrat the di things in my own application and i want to use this perfectly, i used in my DDD structer of code where i am using like this:
for registration new user or login case i need to talk with sqlmodel so it need session, and as the docs satwe will use one engine over my repo and a new session per request so your di-flask library i used here like this i say below i am summarizing the codes form different parts in below:

def get_session() -> Generator[Session, None, None]:
    with Session(engine) as session:
    yield session

# TODO i need to confirm using this di-flask will ok
SessionDep = Annotated[Session,Depends(get_session)]

def get_sqlmodel_repository(
    session: SessionDep,
) -> UserRepository: #This userrepository is a protocol class
       return SQLModelUserRepository(
        session=session,
    )

if config.login_provier_value == "SQLMODEL":
    user_repository_provider = get_sqlmodel_repository

UserRepositoryDep = Annotated[
    UserRepository,
    Depends(
        user_repository_provider,
    ),
]

def get_registration_service(
    user_repository: UserRepositoryDep,
) -> RegistrationService:
    return RegistrationService( #this has business logics in methods
        user_repository=user_repository,
    )
# for login_service i will use like this upper UserRepositoryDep

# i will call this below Dep in the routes.py' function
RegistrationServiceDep = Annotated[
    RegistrationService,
    Depends(
    get_registration_service,
    ),
]

# Below is my routes.py code having this,

@auth_bp.route(
    rule="/register",
    methods=["GET", "POST"],
)
def register(
    register_service: RegistrationServiceDep,
)...

See like this i use the Depends() from your library which is now like the fastapi dependency, now what i think is fully correct to use now right fully?
As this readme says it will work like Nested Dependencies, so i thought this will work, but i cannot test this until i impliment the real flask_login login things, the problem i am getting is:
flask_login need a @user_loader which will call .find_user_by_id() method from the UserRepository, but how i will give there the session dep when it will use the Sqlmodel,

@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)

How and where i will use the session if this will use sqlmodel, if it will use other then session will not use here, pls i really searched about this a lot lot full i dont get how i will do so pls help me how i will insert per session on this user_loader fun ?

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Python

29 August 2026 18:00

As that comes later
Whats the use of uv if you dont know what it does?

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