get_or_create method for entities

A method like get_or_create would be useful to avoid boilerplate code with the following pattern:

@classmethod
def get_or_create(cls, **kwargs):
    r = cls.get(**kwargs)
    if r is None:
        return cls(**kwargs), True
    else:
        return r, False

See also Django’s get_or_create.

I’ve just started looking at Pony ORM, and therefore might have likely missed something.

[cercos]

Has this been implemented yet? This seems like something that would come out of the box

[zhaobenx]

Really need this one