Custom query params in Swagger

[BrianHGrant]

Due to depreciation of YAML docstrings in Django Rest Framework (see: marcgibbons/django-rest-swagger#549), the documented procedure for entering query params that are not fields in model no longer works. Through research and trial and error I have been able to create a workaround:

Step 1. Create a custom filter backend with a get_schema_fields method. This method creates an empty array, then defines each param as a coreapi.field. It then appends them to the fields array and returns this array. IE:

class FireBlockGeoFilter(GeoFilterSet):

class Meta:
    model = FireBlock
    fields = []

def get_schema_fields(self, view):
    fields = []
    lat = coreapi.Field(
        name="lat",
        location="query",
        required=True,
        description="Latitude of search point",
        type="number",
        )
    lon = coreapi.Field(
        name="lon",
        location="query",
        required=True,
        description="Longitude of search point",
        type="number",
        )
    fields.append(lat)
    fields.append(lon)
    return fields

2. This filter is then added to the view as a filter_backend:

filter_backends = (FireBlockGeoFilter,)

The entire view:

class FireBlockGeoFilterViewSet(generics.ListAPIView):

queryset = FireBlock.objects.all
serializer_class = FireBlockSerializer
filter_backends = (FireBlockGeoFilter,)
def get(self, request, *args, **kwargs):
    fireblocks = FireBlock.objects.all
    if request.GET.get('lat', ' ') != ' ' and request.GET.get('lon', ' ') != ' ':
        try:
            lat = float(request.GET.get('lat', ' '))
            lon = float(request.GET.get('lon', ' '))
            pnt = Point(lon, lat, srid=4326)
            fireblocks = FireBlock.objects.filter(geom__contains=pnt)
            if fireblocks:
                serialized_fireblocks = FireBlockSerializer(fireblocks, many=True) # return the serialized fireblock objects
                return Response(serialized_fireblocks.data) #returns to client
            else:
                return Response('No Fireblock found for this latitude and longitude.', status=status.HTTP_404_NOT_FOUND)
        except ValueError:
            return Response('Latitude or longitude is invalid.', status=status.HTTP_404_NOT_FOUND)
    else:
        return Response('Missing latitude or longitude paramater.', status=status.HTTP_400_BAD_REQUEST)

Question: Any better ways to complete this?