Django-Rest-Framework-Gis-Distance

This is a extension to Django-Rest-Framework-Gis that adds sorting and distance distance to the DistanceToPointerFilter.

Requirements

• Python 2.7
• Django 1.7+
• Django-Rest-Framework-Gis 0.10+

Installation

Install the library with pip:

$ pip install djangorestframework-gis-distance

Quick Setup

Make sure rest_framework_gis_distance is added to your INSTALLED_APPS, after rest_framework and restframework_gis.

INSTALLED_APPS = (
    # ...

    'rest_framework',
    'rest_framework_gis',
    'rest_framework_gis_distance',
)

Usage

Regular implementation

First include DistanceField in your serializer.

from restframework_gis_distance.fields import DistanceField

class RecordSerializer(serializers.ModelSerializer):
    distance = DistanceField(unit='m')

    class Meta:
        model = Record
        fields = ('location', 'title', 'created', 'distance')

Then use the filter OrderedDistanceToPointFilter in your view.

from restframework_gis_distance.filters import OrderedDistanceToPointFilter

class RecordListView(mixins.ListModelMixin, generics.GenericAPIView):
    permission_classes = (AllowAny,)
    serializer_class = RecordSerializer
    queryset = Record.objects.all()
    filter_backends = (OrderedDistanceToPointFilter,)
    distance_filter_field = 'location'
    distance_filter_convert_meters = True
    distance_filter_add_distance = True

After this, set up your urls as usual and call your endpoint like this: example.com/api/endpoint/?dist=1000&point=long,lat

Optional field

Using distance as a optional field (for the cases when you only want to display distance when geo coordinates is supplied)

Instead of declaring a straight DistanceField, wrap the DistanceField as a SerializerMethodField, like this:

from restframework_gis_distance.filters import OrderedDistanceToPointFilter

class RecordOptionalSerializer(serializers.ModelSerializer):
    distance = serializers.SerializerMethodField()

    class Meta:
        model = Record
        fields = ('location', 'title', 'created', 'distance')

    def get_distance(self, obj):
        distance = getattr(obj, "distance", None)
        return DistanceField(unit='m').to_representation(distance)

Options

These belong in your DRF view:

• distance_filter_field: Target geo filtering field (inherited from DistanceToPointerFilter).
• distance_srid: (Optional) The srid you want to use on your distance. (Default 4326)
• distance_sort_order: (Optional) Indicates the sort order, closest (True) or farthest (False). (Default: True)

Questions

• How do I change distance unit?
  • Add the param unit=DESIRED_UNIT to your DistanceField, make sure you use a django supported unit.

Tests

This library include tests, just run python runtests.py.

Contributing

Want to contribute? Awesome. Just send a pull request.

License

Django-Rest-Framework-Gis-Distance is released under the MIT License.