old_contents: from django.contrib.auth.decorators import login_required
  from django.contrib.auth.models import User
  from django.core.urlresolvers import reverse
  from django.http import HttpResponseRedirect
  from django.shortcuts import render
  
  from books import models
  from books import forms
  
  
  @login_required
  def receipt_list(request, user_id):
      user = User.objects.get(id=user_id)
      ctx = {}
      ctx['user'] = user
      ctx['receipts'] = models.Receipt.objects.filter(user=user).order_by('-id')
      return render(request, 'receipt_list.html', context=ctx)
  
  
  @login_required
  def receipt_create(request, user_id):
      if request.method == "POST":
          form = forms.ReceiptForm(request.POST)
          if form.is_valid():
              data = form.cleaned_data
              models.Receipt.objects.create(title=data.get("title"),
                                            price=data.get("price"),
                                            user=request.user)
              return HttpResponseRedirect(reverse('receipt_list',
                                                  args=[request.user.id]))
      else:
          form = forms.ReceiptForm()
  
      return render(request, 'receipt_create.html', {'form': form})
  
new_contents: from django.contrib.auth.decorators import login_required
  from django.contrib.auth.models import User
  from django.core.urlresolvers import reverse
  from django.shortcuts import redirect
  from django.shortcuts import render
  
  from books import models
  from books import forms
  
  
  @login_required
  def receipt_list(request, user_id):
      user = User.objects.get(id=user_id)
      ctx = {}
      ctx['user'] = user
      ctx['receipts'] = models.Receipt.objects.filter(user=user).order_by('-id')
      return render(request, 'receipt_list.html', context=ctx)
  
  
  @login_required
  def receipt_create(request, user_id):
      if request.method == "POST":
          form = forms.ReceiptForm(request.POST)
          if form.is_valid():
              form.instance.user = request.user
              form.save()
              return redirect(reverse('receipt_list', args=[request.user.id]))
      else:
          form = forms.ReceiptForm()
  
      return render(request, 'receipt_create.html', {'form': form})
  
subject: Use form.save for receipt creation