@api_view(['GET', 'POST', 'DELETE'])
def category(request, pk):
    """Категория по id"""

    if request.method == 'POST':
        try:
            # edit
            cat = Category.objects.get(pk=pk)
            serializer = CategorySerializer(cat, data=request.data)
            if serializer.is_valid():
                serializer.save()
                return Response(serializer.data)
            print ('1 '*50)
            print (serializer.data)
        except Category.DoesNotExist:
            # create
            serializer = CategorySerializer(data=request.data)
            if serializer.is_valid():
                serializer.save()
                return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
    try:
        cat = Category.objects.get(pk=pk)
    except Category.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)

    if request.method == 'GET':
        print ('GET '*10)
        serializer = CategorySerializer(cat)
        return Response(serializer.data)

    elif request.method == 'DELETE':
        print ('DELETE '*10)
        cat.delete()
        return Response("OK")