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https://github.com/flavors/django-graphql-geojson
GeoJSON support for Graphene Django
https://github.com/flavors/django-graphql-geojson
django filters geodjango geojson gis graphene graphql maps
Last synced: about 1 month ago
JSON representation
GeoJSON support for Graphene Django
- Host: GitHub
- URL: https://github.com/flavors/django-graphql-geojson
- Owner: flavors
- License: mit
- Created: 2018-01-28T14:43:44.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2019-02-10T17:31:57.000Z (almost 6 years ago)
- Last Synced: 2024-10-05T15:37:23.246Z (2 months ago)
- Topics: django, filters, geodjango, geojson, gis, graphene, graphql, maps
- Language: Python
- Homepage: https://pypi.python.org/pypi/django-graphql-geojson
- Size: 56.6 KB
- Stars: 64
- Watchers: 5
- Forks: 4
- Open Issues: 7
-
Metadata Files:
- Readme: README.rst
- Changelog: CHANGES.rst
- License: LICENSE
Awesome Lists containing this project
- awesome-starred - flavors/django-graphql-geojson - GeoJSON support for Graphene Django (graphql)
README
Django GraphQL GeoJSON
======================
|Pypi| |Wheel| |Build Status| |Codecov| |Code Climate|
`GeoJSON`_ support for `Django GraphQL`_
.. _GeoJSON: http://geojson.org
.. _Django GraphQL: https://github.com/graphql-python/graphene-django
Dependencies
------------
* Python ≥ 3.4
* Django ≥ 1.11
Installation
------------
Install last stable version from Pypi.
.. code:: sh
pip install django-graphql-geojson
GeoJSONType
-----------
``GeoJSONType`` is a subclass of ``DjangoObjectType`` which provides GraphQL fields in **GeoJSON** format.
Just define a ``Meta.geojson_field`` to be represented as a ``Geometry`` type.
**models.py**
.. code:: python
from django.contrib.gis.db import models
class Place(models.Model):
name = models.CharField(max_length=255)
location = models.PointField()
**schema.py**
.. code:: python
import graphene
import graphql_geojson
class PlaceType(graphql_geojson.GeoJSONType):
class Meta:
model = models.Place
geojson_field = 'location'
class Query(graphene.ObjectType):
places = graphene.List(PlaceType)
schema = graphene.Schema(query=Query)
**Query**
.. code:: graphql
query {
places {
id
type
geometry {
type
coordinates
}
bbox
properties {
name
}
}
}
Geometry Type
-------------
``Geometry`` is a special GraphQL type that represents a `GEOS geometry object`_.
.. _GEOS geometry object: https://docs.djangoproject.com/en/2.0/ref/contrib/gis/geos/#geometry-objects
**schema.py**
.. code:: python
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**
.. code:: graphql
mutation CreatePlace($name: String!, $location: Geometry!) {
createPlace(name: $name, location: $location) {
place {
id
}
}
}
``Geometry`` type may be initialized in a few ways:
- Well-known text (WKT):
.. code:: python
"POINT(5 23)"
- Hexadecimal (HEX):
.. code:: python
"010100000000000000000014400000000000003740"
- GeoJSON:
.. code:: python
{
"type": "Point",
"coordinates": [5, 23]
}
GeometryFilterSet
-----------------
Django GraphQL GeoJSON provides a custom FilterSet for `spatial lookups`_.
.. _spatial lookups: https://docs.djangoproject.com/en/2.0/ref/contrib/gis/geoquerysets/#spatial-lookups
The ``Meta.fields`` option is combined with model to automatically generate filters.
**filters.py**
.. code:: python
from graphql_geojson.filters import GeometryFilterSet
class PlaceFilter(GeometryFilterSet):
class Meta:
model = models.Place
fields = {
'name': ['exact'],
'location': ['exact', 'intersects', 'distance_lte'],
}
**schema.py**
.. code:: python
import graphene
import graphql_geojson
from graphene import relay
from graphene_django.filter import DjangoFilterConnectionField
class PlaceNode(graphql_geojson.GeoJSONType):
class Meta:
model = Place
interfaces = [relay.Node]
geojson_field = 'location'
class Query(graphene.ObjectType):
places = DjangoFilterConnectionField(
PlaceNode,
filterset_class=PlaceFilter)
**Query**
.. code:: graphql
query Places($geometry: Geometry!){
places(location_Intersects: $geometry) {
edges {
node {
id
}
}
}
}
`Distance lookups`_ take a ``Distance`` parameter comprising:
- The desired `unit attribute`_ name
- Distance value
- A geometry to base calculations from
.. _Distance lookups: https://docs.djangoproject.com/en/2.0/ref/contrib/gis/db-api/#distance-lookups
.. _unit attribute: https://docs.djangoproject.com/en/2.0/ref/contrib/gis/measure/#supported-units
.. code:: graphql
query Places(
$unit: DistanceUnitEnum!,
$value: Float!,
$geometry: Geometry!)
{
places(location_DistanceLte: {
unit: $unit,
value: $value,
geometry: $geometry
}) {
edges {
node {
id
}
}
}
}
----
.. raw:: html
If you have a problem don't hesitate to ask for assistance.
.. |Pypi| image:: https://img.shields.io/pypi/v/django-graphql-geojson.svg
:target: https://pypi.python.org/pypi/django-graphql-geojson
.. |Wheel| image:: https://img.shields.io/pypi/wheel/django-graphql-geojson.svg
:target: https://pypi.python.org/pypi/django-graphql-geojson
.. |Build Status| image:: https://travis-ci.org/flavors/django-graphql-geojson.svg?branch=master
:target: https://travis-ci.org/flavors/django-graphql-geojson
.. |Codecov| image:: https://img.shields.io/codecov/c/github/flavors/django-graphql-geojson.svg
:target: https://codecov.io/gh/flavors/django-graphql-geojson
.. |Code Climate| image:: https://api.codeclimate.com/v1/badges/67dbb917ad4cf8c422a6/maintainability
:target: https://codeclimate.com/github/flavors/django-graphql-geojson