#!hyphen-venv/bin/python
import imp
from migrate.versioning import api
from app import db
from config import SQLALCHEMY_DATABASE_URI
from config import SQLALCHEMY_MIGRATE_REPO

migration = SQLALCHEMY_MIGRATE_REPO + \
                '/versions/%03d_migration.py' % \
                (api.db_version(
                            SQLALCHEMY_DATABASE_URI, 
                            SQLALCHEMY_MIGRATE_REPO) + 1)

tmp_module = imp.new_module('old_model')
old_model = api.create_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)

exec old_model in tmp_module.__dict__

script = api.make_update_script_for_model(
                SQLALCHEMY_DATABASE_URI,
                SQLALCHEMY_MIGRATE_REPO, 
                tmp_module.meta, db.metadata)

open(migration, "wt").write(script)
api.upgrade(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)

print 'New migration saved as ' + migration
print 'Current database version: ' + \
               str(api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO))