unresolved attribute "Column" in class "SQLAlchemy"

The constructor of the flask_sqlalchemy.SQLAlchemy class calls _include_sqlalchemy, which attaches all attributes from sqlalchemy and sqlalchemy.orm to its instances.

This is only done at runtime and not detected by PyCharm's code inspection.

It would require flask_sqlalchemy to use a more standard way of importing those attributes, like from sqlalchemy import *. But this would import the attributes into the flask_sqlalchemy module instead of each instance of SQLAlchemy and thus change the way they're accessed.

I'm not a Python or SQLAlchemy expert and won't judge whether this is good design or not but you could open an issue on https://github.com/pallets/flask-sqlalchemy and discuss it there.

here is what I do.

from flask_sqlalchemy import SQLAlchemy
from typing import Callable


class MySQLAlchemy(SQLAlchemy):  # Or you can add the below code on the SQLAlchemy directly if you think to modify the package code is acceptable.
    Column: Callable  # Use the typing to tell the IDE what the type is.
    String: Callable
    Integer: Callable


db = MySQLAlchemy(app)


class User(db.Model, UserMixin):
    __tablename__ = "users"
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(20))  # The message will not show: Unresolved attribute reference 'Column' for class 'SQLAlchemy' 

    def __init__(self, *args, **kwargs): 
        super().__init__(*args, **kwargs)


def create_test_data():
    db.create_all()
    test_user = User(name='Frank')  # I add __init__, so it will not show you ``Unexpected argument``
    db.session.add(test_user)
    db.session.commit()

unresolved attribute "Column" in class "SQLAlchemy"

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