old_contents: from rest_framework import mixins, serializers, viewsets
  
  from .models import Route, Trip
  
  
  class TripSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Trip
          fields = ('id', 'gtfs_trip_id', 'version', 'route', 'trip_headsign', 'trip_short_name', 'direction', 'wheelchair_accessible', 'bikes_allowed', 'notes', 'created_at')
  
  
  class TripViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
      queryset = Trip.objects.all()
      serializer_class = TripSerializer
  
  
  class RouteSerializer(serializers.HyperlinkedModelSerializer):
      trip_set = serializers.HyperlinkedRelatedField(
          many=True,
          read_only=True,
          view_name='trip-detail'
      )
  
      class Meta:
          model = Route
          fields = ('id', 'url', 'gtfs_route_id', 'short_name', 'long_name', 'description', 'color', 'text_color', 'route_url', 'trip_set')
  
  
  class RouteViewSet(viewsets.ReadOnlyModelViewSet):
      queryset = Route.objects.all()
      serializer_class = RouteSerializer
  
new_contents: from rest_framework import filters, mixins, serializers, viewsets
  
  from .models import Route, Trip
  
  
  class TripSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Trip
          fields = ('id', 'gtfs_trip_id', 'version', 'route', 'trip_headsign', 'trip_short_name', 'direction', 'wheelchair_accessible', 'bikes_allowed', 'notes', 'created_at')
  
  
  class TripViewSet(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
      queryset = Trip.objects.all()
      serializer_class = TripSerializer
  
  
  class RouteSerializer(serializers.HyperlinkedModelSerializer):
      trip_set = serializers.HyperlinkedRelatedField(
          many=True,
          read_only=True,
          view_name='trip-detail'
      )
  
      class Meta:
          model = Route
          fields = ('id', 'url', 'gtfs_route_id', 'short_name', 'long_name', 'description', 'color', 'text_color', 'route_url', 'trip_set')
  
  
  class RouteViewSet(viewsets.ReadOnlyModelViewSet):
      queryset = Route.objects.all()
      serializer_class = RouteSerializer
      filter_backends = (filters.SearchFilter,)
      search_fields = ('short_name', 'long_name', 'description')
  
subject: Add search feature to the Route API.