old_contents: from django.http import HttpResponse
  from django.views.decorators.csrf import csrf_exempt
  from rest_framework.decorators import api_view
  from rest_framework.response import Response
  
  from api.models import Food, DietPlan
  from api.serializers import FoodSerializer, DietPlanSerializer
  
  
  def api_index(request):
      return HttpResponse("Hello, you've reached the API index.")
  
  
  @csrf_exempt
  @api_view(['GET'])
  def food_list(request):
      if request.method == 'GET':
          try:
              foods = Food.objects.filter(owner=request.user)
          except TypeError as e:
              print(e.msg)
              return HttpResponse(status=403)
          serializer = FoodSerializer(foods, many=True)
          return Response(serializer.data)
  
  
  @api_view(['GET'])
  def food_detail(request):
      pass
  
  
  @api_view(['GET'])
  def plan_list(request):
      if request.method == 'GET':
          try:
              plans = DietPlan.objects.filter(owner=request.user)
          except TypeError as e:
              print(e.msg)
              return HttpResponse(status=403)
          serializer = DietPlanSerializer(plans, many=True)
          return Response(serializer.data)
  
  
  @api_view(['GET'])
  def plan_detail(request):
      pass
  
  
  @api_view(['GET'])
  def food_list_for_plan(request):
      pass
  
new_contents: from django.http import HttpResponse
  from django.views.decorators.csrf import csrf_exempt
  from rest_framework.decorators import api_view
  from rest_framework.response import Response
  
  from api.models import Food, DietPlan
  from api.serializers import FoodSerializer, DietPlanSerializer
  
  
  def api_index(request):
      return HttpResponse("Hello, you've reached the API index.")
  
  
  @csrf_exempt
  @api_view(['GET'])
  def food_list(request):
      """Return all food records owned by the current user"""
      if request.method == 'GET':
          try:
              foods = Food.objects.filter(owner=request.user)
          except TypeError as e:
              print(e.msg)
              return HttpResponse(status=403)
          serializer = FoodSerializer(foods, many=True)
          return Response(serializer.data)
  
  
  @api_view(['GET'])
  def food_detail(request, pk):
      """Return details for the food with the given pk"""
      pass
  
  
  @api_view(['GET'])
  def plan_list(request):
      """Return all diet plan records owned by the current user"""
      if request.method == 'GET':
          try:
              plans = DietPlan.objects.filter(owner=request.user)
          except TypeError as e:
              print(e.msg)
              return HttpResponse(status=403)
          serializer = DietPlanSerializer(plans, many=True)
          return Response(serializer.data)
  
  
  @api_view(['GET'])
  def plan_detail(request, pk):
      """Return details for the diet plan with the given pk"""
      pass
  
  
  @api_view(['GET'])
  def food_list_for_plan(request):
      """Return all foods belonging to the diet plan with the given pk"""
      pass
  
subject: add docstrings and add pk parameter to detail views