I defined 3 models related with M2M relationsships
class Suite(models.Model): name = models.CharField(max_length=250) title = models.CharField(max_length
There is a simple solution. Just use
self.queryset = self.queryset |
instead of
self.queryset = self.queryset.union()
Worked for me. I hope this is understandable. After this you will be able to use filter.