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Python script to make SQLAlchemy DB migrations in a flask app
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#!flask/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 | |
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO) | |
migration = SQLALCHEMY_MIGRATE_REPO + ('/versions/%03d_migration.py' % (v+1)) | |
tmp_module = imp.new_module('old_model') | |
old_model = api.create_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO) | |
exec(old_model, 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) | |
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO) | |
print('New migration saved as ' + migration) | |
print('Current database version: ' + str(v)) |
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