def check_free_tables(request):
    from django.db.models import Count
    from django.db.models import Q

    if request.is_ajax and request.method == 'GET':
        date = request.GET.get('date')
        tab = Table.objects.annotate(order_cnt=Count('order_table', filter=Q(order_table__date=date)))
        print(date)
        ser_instance = serializers.serialize('json', list(tab), fields=('id',  'order_cnt'))
        return JsonResponse({'tables': ser_instance}, status=200, safe=False)