def initial(self, request, *args, **kwargs):
super(NodeRelationViewMixin, self).initial(request, *args, **kwargs)<EOL>self.node = get_object_or_404(Node, **{'<STR_LIT>': self.kwargs['<STR_LIT>']})<EOL>self.queryset = self.model.objects.filter(node_id=self.node.id)<EOL>
Custom initial method:
    * ensure node exists and store it in an instance attribute
    * change queryset to return only comments of current node