db_migrate.py

#!/Users/mbasanta/virtualenvs/QR5Server/bin/python

import imp
from migrate.versioning import api
from qr5server import db
from config import BaseConfiguration

DATABASE_URI = BaseConfiguration.SQLALCHEMY_DATABASE_URI
MIGRATE_REPO = BaseConfiguration.SQLALCHEMY_MIGRATE_REPO

v = api.db_version(DATABASE_URI, MIGRATE_REPO)
migration = MIGRATE_REPO + ('/versions/%03d_migration.py' % (v+1))

tmp_module = imp.new_module('old_model')
old_model = api.create_model(DATABASE_URI, MIGRATE_REPO)

exec(old_model, tmp_module.__dict__)
script = api.make_update_script_for_model(DATABASE_URI,
                                          MIGRATE_REPO,
                                          tmp_module.meta,
                                          db.metadata)
open(migration, "wt").write(script)

api.upgrade(DATABASE_URI, MIGRATE_REPO)
v = api.db_version(DATABASE_URI, MIGRATE_REPO)

print('New migration saved as ' + migration)
print('Current database version: ' + str(v))