Flask Application (MySQL) - KeyError: 'migrate' - mysql

Question

In order to perform a migration, through commands flask db init and flask db migrate, I receive the following error: directory = current_app.extensions['migrate'].directory KeyError: 'migrate'.
I have created a Migrate object within my __init__.py file, however, still receive the error stated above:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from config import app_config
from flask_login import LoginManager
from flask_migrate import Migrate
# Creating Flask app.
app = Flask(__name__)
# Database variable initialisation.
db = SQLAlchemy()
login_manager = LoginManager()
def create_app(config_name):
app = Flask(__name__, instance_relative_config=True)
app.config.from_object(app_config[config_name])
app.config.from_pyfile('config.py')
db.init_app(app)
# Creating login manager object and initialising it.
# Login view and message prevent a user to accessing a page they are not authorised to.
login_manager.init_app(app)
login_manager.login_message = "Please login to access this page."
login_manager.login_view = "auth.login"
migrate = Migrate(app, db)
from app import models
return app
Any advice for what I am doing wrong? I have already viewed quite a few pages related to this error and have implemented the possible alterations.

Answer 1

I found the problem. The above __init__.py class was completely fine.
My config.py file which contained the following code:
SQLALCHEMY_DATABASE_URI = 'mysql+mysqlconnector://{db_user}:{my_password}#localhost/{database}'
... had a format extension to it which was not needed. I have successfully updated my database.