def _get_all_migrations():
    from . import migrations
    package = migrations
    prefix = package.__name__ + '.'
    all_migrations = []
    for importer, modname, ispkg in pkgutil.iter_modules(package.__path__, prefix):
        version = int(modname.split('.')[-1].split('_')[0])
        all_migrations.append((version, modname))
    all_migrations = sorted(all_migrations, key=lambda x: x[0])
    return all_migrations