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Making Flask Migrations

Making Flask Migrations

Learn how to make migrations in Flask.

We'll cover the following...

Creating a migration file

We must create a migration file to make migrations in our Core app. Let’s create a migration file in the backendservice2 folder named manager.py. Then, we can open the file and import the following modules:

Python
from core import core
from core import db
from flask_migrate import Migrate
from flask_migrate import MigrateCommand
from flask_script import Manager

  • Lines 1–2: We import our Flask application instance, core, and our MySQL database instance, db, from our core.py.

  • Lines 3–4: We import Migrate and the MigrateCommand from flask_migrate.

  • Line 5: We import the Manager from flask_script.

Now that we are done with the imports necessary for our migration file to function correctly, we can handle migrations in the following way:

Python
migrate = Migrate(core, db)
manager = Manager(core)
manager.add_command('db', MigrateCommand)
if __name__ == '__main__':
    manager.run()

  • Line 1: We create an instance of Migrate, migrate, passing our Flask application instance core and database db as arguments.

  • Line 3: ...