<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update_object(self, obj, data, view_kwargs):
 """Update an object through sqlalchemy :param DeclarativeMeta obj: an object from sqlalchemy :param dict data: the data validated by marshmallow :param dict view_kwargs: kwargs from the resource view :return boolean: True if object have changed else False """

        if obj is None:
            url_field = getattr(self, 'url_field', 'id')
            filter_value = view_kwargs[url_field]
            raise ObjectNotFound('{}: {} not found'.format(self.model.__name__, filter_value),
                                 source={'parameter': url_field})

        self.before_update_object(obj, data, view_kwargs)

        relationship_fields = get_relationships(self.resource.schema, model_field=True)
        nested_fields = get_nested_fields(self.resource.schema, model_field=True)

        join_fields = relationship_fields + nested_fields

        for key, value in data.items():
            if hasattr(obj, key) and key not in join_fields:
                setattr(obj, key, value)

        self.apply_relationships(data, obj)
        self.apply_nested_fields(data, obj)

        try:
            self.session.commit()
        except JsonApiException as e:
            self.session.rollback()
            raise e
        except Exception as e:
            self.session.rollback()
            raise JsonApiException("Update object error: " + str(e), source={'pointer': '/data'})

        self.after_update_object(obj, data, view_kwargs)