[Answered ]-Delete user specific content in django

You can just put simple verification into your DeleteTodo view:

class DeleteTodo( LoginRequiredMixin, DeleteView ):
  model = TodoList
  success_url = reverse_lazy( 'todo' )
  template_name = 'deleteobject.html'

  def get_object(self):
    obj = super(DeleteTodo, self).get_object()
    if obj.trainee.user != self.request.user:
      return None # or raise Http404
    return obj

You can also specify queryset (via get_queryset method) into your delete view that will filter only user objects.