Class for dynamically generating a Django QuerySet from a list of Django objects of the same type.

gistfile1.py

from django.db.models.query import QuerySet


class QuerySetFromIter(QuerySet):
    def __init__(self, objects=[], model=None, query=None, *args, **kwargs):
        if model is None:
            if len(objects):
                model = type(objects[0])
            else:
                # TODO: find a better way to handle this
                raise ValueError(
                    'If objects is empty, a model must be included')

        pk_list = []
        for r in objects:
            if not type(r) is model:
                raise TypeError('All objects must be the same model')
            pk_list.append(r.id)
        super(QuerySetFromIter, self).__init__(model, query, *args, **kwargs)
        self._result_cache = list(objects)
        self.query.add_filter(('pk__in', pk_list))

    def _clone(self, klass=None, setup=False, **kwargs):
        if klass is None:
            klass = self.__class__.__base__
        return super(QuerySetFromIter, self)._clone(klass, setup, **kwargs)