Flask migrate sqlalchemy not found

[TomasAm]

Good day,

I am trying to make migration via Flask/Migrate/SQLAlchemy and getting the following error:

1 2	'The sqlalchemy extension was not registered to the current ' \ AssertionError: The sqlalchemy extension was not registered to the current application.  Please make sure to call init_app() first.

What could be the reason?

My run.py file is inside project folder. run.py contains code:

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from flaskblog import app, db from flask import Flask   db.init_app(app) if __name__ == '__main__':     app.run(debug=True, port=5002)     socketio.run(app)

Inside project folder there is flaskblog folder. Then __init__ file there contains code:

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from flask import Flask from flask_sqlalchemy import SQLAlchemy from flask_migrate import Migrate #... other packages..   basedir = os.path.abspath(os.path.dirname(__file__)) app = Flask(__name__) app.config['SECRET_KEY'] = 'dfjkfjkfdjklfjlkfdlfdlkj' app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////home/tomas/searvice/flaskblog/site.db' #...   db = SQLAlchemy(metadata=MetaData(naming_convention=naming_convention))   migrate = Migrate(app, db) migrate.init_app(app, db, render_as_batch=True)   #...

So in terminal inside project folder I was not sure how to set

1	FLASK_APP=WhatToTypeHere?"

Instead I wrote command

1	export FLASK_APP=flaskblog

1	flask db init

worked, but

1	flask db migrate

returns the error I have mentioned.

[Larz60+]

Miguel Grinberg goes over this in detail.
I can't point out the exact location in Miguel Grinberg's tutorial on migrations, but it's somewhere around here:
https://blog.miguelgrinberg.com/post/the...v-database

[TomasAm]

Error was in this line:

1	db = SQLAlchemy(metadata=MetaData(naming_convention=naming_convention))

should be db =SQLAlchemy(app)