I think my comment is not clear. I want to test `g.user` as a parameter in chain, Here `load_models` loads more than one model, so I choose second model as `container` which don't have any relation. 
```
@load_models(
    (User, {'username': 'username'}, 'g.user')
    )
def t_load_user_to_g(user):
```
Doing above contradicts purpose `load_models`.