##############################################################################
# Copyright (c) 2020 Parker Berberian and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

from django.core.exceptions import ObjectDoesNotExist


class AbstractModelQuery():
    """
    This is a class made for querying abstract models.

    This class is itself abstract. create subclasses to
    query your own abstract models.
    """

    model_list = []

    @classmethod
    def filter(cls, *args, **kwargs):
        """
        Query all concrete model classes.

        Iterates over the model list and returns a list of all
        matching models from the classes given.
        Filter queries are given here as normal and are passed into the Django ORM
        for each concrete model
        """
        result = []
        for model in cls.model_list:
            result += list(model.objects.filter(*args, **kwargs))

        return result

    @classmethod
    def get(cls, *args, **kwargs):
        try:
            return cls.filter(*args, **kwargs)[0]
        except IndexError:
            raise ObjectDoesNotExist()