# Flask-Migrate

**Repository Path**: mirrors_asmodehn/Flask-Migrate

## Basic Information

- **Project Name**: Flask-Migrate
- **Description**: SQLAlchemy database migrations for Flask applications using Alembic
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-09-24
- **Last Updated**: 2026-06-06

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

Flask-Migrate
=============

[![Build Status](https://travis-ci.org/miguelgrinberg/Flask-Migrate.png?branch=master)](https://travis-ci.org/miguelgrinberg/Flask-Migrate)

Flask-Migrate is an extension that handles SQLAlchemy database migrations for Flask applications using Alembic. The database operations are provided as command line arguments for Flask-Script.

Installation
------------

Install Flask-Migrate with `pip`:

    pip install Flask-Migrate

Example
-------

This is an example application that handles database migrations through Flask-Migrate:

```python
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.script import Manager
from flask.ext.migrate import Migrate, MigrateCommand

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///app.db'

db = SQLAlchemy(app)
migrate = Migrate(app, db)

manager = Manager(app)
manager.add_command('db', MigrateCommand)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(128))

if __name__ == '__main__':
    manager.run()
```

With the above application you can create the database or enable migrations if the database already exists with the following command:

    $ python app.py db init
    
This will add a `migrations` folder to your application. The contents of this folder need to be added to version control along with your other source files. 

You can then generate an initial migration:

    $ python app.py db migrate
    
The migration script needs to be reviewed and edited, as Alembic currently does not detect every change you make to your models. In particular, Alembic is currently unable to detect indexes. Once finalized, the migration script also needs to be added to version control.

Then you can apply the migration to the database:

    $ python app.py db upgrade
    
Then each time the database models change repeat the `migrate` and `upgrade` commands.

To sync the database in another system just refresh the `migrations` folder from source control and run the `upgrade` command.

To see all the commands that are available run this command:

    $ python app.py db --help

Resources
---------

- [Documentation](http://pythonhosted.org/Flask-Migrate)
- [pypi](https://pypi.python.org/pypi/Flask-Migrate)