Raise error whether field's absent

apps/booking/models/services.py

@@ -31,7 +31,8 @@ class AbstractBookingService(ABC):
     @abstractmethod
     def check_whether_booking_available(self, restaurant_id, date):
         """ checks whether booking is available """
-        pass
+        if date is None:
+            raise serializers.ValidationError(detail='date query param is required')
 
     @abstractmethod
     def cancel_booking(self, payload):
@@ -66,6 +67,7 @@ class GuestonlineService(AbstractBookingService):
         return {'X-Token': self.token, 'Content-type': 'application/json', 'Accept': 'application/json'}
 
     def check_whether_booking_available(self, restaurant_id, date: str):
+        super().check_whether_booking_available(restaurant_id, date)
         url = f'{self.url}v1/runtime_services'
         params = {'restaurant_id': restaurant_id, 'date': date, 'expands[]': 'table_availabilities'}
         r = requests.get(url, headers=self.get_common_headers(), params=params)
@@ -126,6 +128,7 @@ class LastableService(AbstractBookingService):
                 'Accept': 'application/json'}
 
     def check_whether_booking_available(self, restaurant_id, date):
+        super().check_whether_booking_available(restaurant_id, date)
         return False
 
     def commit_booking(self, payload):

apps/booking/serializers/web.py

@@ -11,9 +11,24 @@ class BookingSerializer(serializers.ModelSerializer):
         )
 
 
+class CheckBookingSerializer(serializers.ModelSerializer):
+    available = serializers.BooleanField()
+    type = serializers.ChoiceField(choices=models.Booking.AVAILABLE_SERVICES, allow_null=True)
+    details = serializers.DictField()
+
+    class Meta:
+        model = models.Booking
+        fields = (
+            'available',
+            'type',
+            'details',
+        )
+
+
 class PendingBookingSerializer(serializers.ModelSerializer):
-    restaurant_id = serializers.IntegerField(min_value=0, )
+    restaurant_id = serializers.IntegerField(read_only=True)
     id = serializers.ReadOnlyField()
+    user = serializers.ReadOnlyField()
 
     class Meta:
         model = models.Booking

apps/booking/views.py

@@ -5,15 +5,14 @@ from establishment.models import Establishment
 from booking.models.models import Booking, GuestonlineService, LastableService
 from rest_framework.response import Response
 from booking.serializers.web import (PendingBookingSerializer,
-                                     UpdateBookingSerializer, GetBookingSerializer)
-from utils.serializers import EmptySerializer
+                                     UpdateBookingSerializer, GetBookingSerializer, CheckBookingSerializer)
 
 
 class CheckWhetherBookingAvailable(generics.GenericAPIView):
     """ Checks which service to use if establishmend is managed by any """
 
     permission_classes = (permissions.AllowAny,)
-    serializer_class = EmptySerializer
+    serializer_class = CheckBookingSerializer
     pagination_class = None
 
     def get(self, request, *args, **kwargs):