old_contents: from django.views.generic import DetailView, UpdateView
  from django.contrib.auth.views import redirect_to_login
  from django.core.urlresolvers import reverse
  from django.shortcuts import redirect
  
  from braces.views import LoginRequiredMixin
  
  from .models import User
  
  
  class ProfileDetailView(DetailView):
      '''
      Displays the user profile information
      '''
      model = User
      slug_field = 'username'
      slug_url_kwarg = 'username'
  
      def get(self, request, *args, **kwargs):
          user = request.user
          username = self.kwargs.get(self.slug_url_kwarg)
  
          if user.is_authenticated() and not username:
              return redirect('profile_detail', username=user.username)
          elif not user.is_authenticated() and not username:
              return redirect_to_login(reverse('profile_detail_me'))
  
          return super(ProfileDetailView, self).get(request, *args, **kwargs)
  
  
  class ProfileUpdateView(LoginRequiredMixin, UpdateView):
      model = User
      slug_field = 'username'
      slug_url_kwarg = 'username'
  
new_contents: from django.views.generic import DetailView, UpdateView
  from django.contrib.auth.views import redirect_to_login
  from django.core.urlresolvers import reverse
  from django.shortcuts import redirect
  
  from braces.views import LoginRequiredMixin
  
  from .models import User
  
  
  class ProfileDetailView(DetailView):
      '''
      Displays the user profile information
      '''
      queryset = User.objects.select_related('location', 'location__country')
      slug_field = 'username'
      slug_url_kwarg = 'username'
  
      def get(self, request, *args, **kwargs):
          user = request.user
          username = self.kwargs.get(self.slug_url_kwarg)
  
          if user.is_authenticated() and not username:
              return redirect('profile_detail', username=user.username)
          elif not user.is_authenticated() and not username:
              return redirect_to_login(reverse('profile_detail_me'))
  
          return super(ProfileDetailView, self).get(request, *args, **kwargs)
  
  
  class ProfileUpdateView(LoginRequiredMixin, UpdateView):
      model = User
      slug_field = 'username'
      slug_url_kwarg = 'username'
  
subject: Use select_related in user profile detail view