Underscore attribute ruins initiating an instance from dict data

[MacHu-GWU]

@attr.s
class User(object):
    _id = attr.ib()
    name = attr.ib()

doc = {"_id": 1, "name": "Alice"}

when working with mongodb, how could I create instance for this from mongodb document?

because we know that User(**doc) doesn't work due to the underscore.

[Tinche]

Well there are many ways. You could try this:

@attr.s
class User(object):
    _id = attr.ib()
    name = attr.ib()

    @classmethod
    def from_mongo(cls, doc):
        return cls(**{k if not k.startswith('_') else k[1:]: v for k, v in doc.items()})

[hynek]

Questions like this are being asked basically once week now. I’m afraid I’ll have to write a lot more docs.

[hynek]

fixed in #370