gistfile1.py

class OrderFilterForm(Form):
    name  = CharField(required = False)
    email = CharField(required = False)
    aec   = CharField(required = False)

    date_created_from = DateField(required = False)
    date_created_to   = DateField(required = False)

    def process(self):
        data  = lambda key: self.cleaned_data.get(key, '')
        query = Q()

        for word in data('name').split():
            query &= (
                Q(user__user__first_name__icontains = word)
              | Q(user__user__last_name__icontains  = word)
            )

        if data('aec'):
            query &= Q(subdeal__deal__aec__icontains = data('aec'))


        if data('email'):
            query &= (
                Q(user__user__email__icontains = data('email').strip())
              | (
                    Q(mporder__isnull = False)
                  & Q(mporder__their_email__icontains = data('email'))
                )
            )

        if data('date_created_from'):
            query &= Q(date_created__gte = data('date_created_from'))

        if data('date_created_to'):
            query &= Q(date_created__lte = data('date_created_to'))

        return query