Schematic soft validation

schematic_soft_validation.py

from __future__ import absolute_import, print_function, unicode_literals

import schematics

from datetime import datetime as Datetime
import datetime

# Third party imports
from bson.objectid import ObjectId

from schematics.models import Model as BaseModel
from schematics.types import *
from schematics.types.compound import *

class Model(BaseModel):
    def to_dict(self):
        return self.to_native()

class ObjectIdType(BaseType):
    def to_native(self, value, context=None):
        return ObjectId(value)
    def to_primitive(self, value, context=None):
        return str(value)

class User(Model):
    _username = StringType()
    test = StringType()

    def __init__(self, data, *args, **kwargs):
        _this_keys = set(self.keys())
        for key in data.keys():
            if key not in _this_keys:
                print(
                    "WARNING: Attribute '{}' not present in class: {}".format(
                    key, self.__class__.__name__))
                data.pop(key)
        super(User, self).__init__(data, *args, **kwargs)

if __name__ == '__main__':
    u = User({'_username': 'username', 'test': 'test'})
    u.validate()
    print(u)

    u = User({'_username': 'username', 'test': 'test', 'unknown': 'unknown'})
    u.validate()
    print(u)