# the view code
def company_list(request):
    qs = Company.objects.all()

    # custom filter using django-filters
    f = CompanyFilter(request.GET, queryset=qs)

    return object_list(request,
                       extra_context={'filter': f},
                       queryset=f.qs.distinct(),
                       template_name='supplier/company/list.html',
                       template_object_name='company',
                       paginate_by=30)



# part of the model code

class Company(models.Model):
    regions = models.ManyToManyField(Region, blank=True, null=True)
    categories = models.ManyToManyField(Category, blank=True, null=True)