Flask Application (MySQL) - KeyError: 'migrate'

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.

Z M · Accepted Answer · 2020-08-03 15:39:34Z

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.

answered Aug 3, 2020 at 15:39

Z M

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