django-graphql-geojson 0.0.3

GeoJSON support for Django GraphQL

GeoJSON support for Django GraphQL

Dependencies

• Python ≥ 3.4

• Django ≥ 1.11

Installation

Update Graphene Django package.

pip install -U git+https://github.com/graphql-python/graphene-django.git@master

Install last stable version from Pypi.

pip install django-graphql-geojson

GeoJSONType

models.py

from django.contrib.gis.db import models


class Place(models.Model):
    name = models.CharField(max_length=255)
    location = models.PointField()

schema.py

import graphql_geojson


class PlaceType(graphql_geojson.GeoJSONType):

    class Meta:
        model = models.Place
        geojson_field = 'location'

Query

query {
  places {
    id
    type
    geometry {
      type
      coordinates
    }
    bbox
    properties {
      name
    }
  }
}

Geometry Type

schema.py

import graphene
import graphql_geojson


class CreatePlace(graphene.Mutation):
    place = graphene.Field(types.PlaceType)

    class Arguments:
        name = graphene.String(required=True)
        location = graphql_geojson.Geometry(required=True)

    @classmethod
    def mutate(cls, root, info, **args):
        place = models.Place.objects.create(**args)
        return cls(place=place)

Mutation

mutation CreatePlace($name: String!, $location: Geometry!) {
  createPlace(name: $name, location: $location) {
    place {
      id
    }
  }
}

Geometry type may be initialized in a few ways:

• Well-known text (WKT):

'POINT(5 23)'

• Hexadecimal (HEX):

'010100000000000000000014400000000000003740'

• GeoJSON:

{
  "type": "Point",
  "coordinates": [
    5.000000,
    23.000000
  ]
}

GeometryFilterSet

filters.py

from graphql_geojson.filters import GeometryFilterSet


class PlaceFilter(GeometryFilterSet):

    class Meta:
        model = models.Place
        fields = {
            'name': ['exact'],
            'location': ['exact', 'intersects'],
        }

schema.py

import graphene
import graphql_geojson
from graphene import relay
from graphene_django.filter import DjangoFilterConnectionField


class PlaceNode(graphql_geojson.GeoJSONType):

    class Meta:
        model = Place
        interfaces = [relay.Node]
        geojson_field = 'location'


class Query(graphene.ObjectType):
    places = DjangoFilterConnectionField(
        PlaceNode,
        filterset_class=PlaceFilter)

Query

query Places($geometry: Geometry!){
  places(location_Intersects: $geometry) {
    edges {
      node {
        id
      }
    }
  }
}