Question

I can’t quite pinpoint where the problem is, could be syntax or there is something about the querysets returned by django I don’t quite get.

Class1(models.Model):
    ...
    def __add__(self,other)
        return other + ({'attribute': value}, ..)

I’m hoping that the addition between classes will return 1 tuple with all the objects and put into it.
Because of that, I’ve had to avoid the sum() function since it’s looking for integers.

Class Summate():
    @staticmethod
    def sum_tuples(items)
        return reduce(lambda y,x: x+y, items)


eg_list = Class1.objects.all()
values = Summate.sum_tuples(eg_list)

I get back an TypeError: reduce() of empty sequence with no initial value.

UPDATE: My lists were empty. I resolved that and received this error

TypeError: unsupported operand type(s) for +: ‘dict’ and ‘dict’
But shouldn’t it be appending the tuple and not the dicts?

Any thoughts? Am I going about this completely wrong?

Thanks,

Answer 1

Your filter must simply be returning no results. I just tested your code and it works.