import peewee as pw


    class Role(pw.Model):
        name = pw.CharField(255, default='user')


    class User(pw.Model):

        created = pw.DateTimeField(default=dt.datetime.now())
        name = pw.CharField(255)
        title = pw.CharField(127, null=True)
        active = pw.BooleanField(default=True)
        rating = pw.IntegerField(default=0)

        role = pw.ForeignKeyField(Role)


    from marshmallow_peewee import ModelSchema

    class UserSchema(ModelSchema):

        class Meta:
            model = User

    role = Role.create()
    user = User.create(name='Mike', role=role)

    result = UserSchema().dump(user)
    print(result)
    # {'active': True,
    #  'created': '2016-03-29T15:27:18.600034+00:00',
    #  'id': 1,
    #  'name': 'Mike',
    #  'rating': 0,
    #  'role': 1,
    #  'title': None}

    result = UserSchema().load(result)
    assert isinstance(result, User)
    assert result.name == 'Mike'

    from marshmallow_peewee import Related

    class UserSchema(ModelSchema):

        role = Related()

        class Meta:
            model = User

    result = UserSchema().dump(user)
    print(result)
    # {'active': True,
    #  'created': '2016-03-29T15:30:32.767483+00:00',
    #  'id': 1,
    #  'name': 'Mike',
    #  'rating': 0,
    #  'role': {'id': 5, 'name': 'user'},
    #  'title': None}

    result = UserSchema().load(result)
    assert isinstance(result, User)
    assert isinstance(result.role, Role)

    import peewee as pw


    class Role(pw.Model):
        name = pw.CharField(255, default='user')


    class User(pw.Model):

        created = pw.DateTimeField(default=dt.datetime.now())
        name = pw.CharField(255)
        title = pw.CharField(127, null=True)
        active = pw.BooleanField(default=True)
        rating = pw.IntegerField(default=0)

        role = pw.ForeignKeyField(Role)


    from marshmallow_peewee import ModelSchema

    class UserSchema(ModelSchema):

        class Meta:

            # model: Bind peewee.Model to the Schema
            model = User

            # model_converter: Use custom model_converter
            # model_converter = marshmallow_peewee.ModelConverter

            # dump_only_pk: Primary key is dump only
            # dump_only_pk = True

            # string_keys: Convert keys to strings
            # string_keys = True