mirror of
https://github.com/django/django.git
synced 2025-10-25 14:46:09 +00:00
69 lines
2.2 KiB
Plaintext
69 lines
2.2 KiB
Plaintext
======================
|
|
``GeoJSON`` Serializer
|
|
======================
|
|
|
|
.. module:: django.contrib.gis.serializers.geojson
|
|
:synopsis: Serialization of GeoDjango models in the GeoJSON format.
|
|
|
|
GeoDjango provides a specific serializer for the `GeoJSON`__ format. See
|
|
:doc:`/topics/serialization` for more information on serialization.
|
|
|
|
__ http://geojson.org/
|
|
|
|
The ``geojson`` serializer is not meant for round-tripping data, as it has no
|
|
deserializer equivalent. For example, you cannot use :djadmin:`loaddata` to
|
|
reload the output produced by this serializer. If you plan to reload the
|
|
outputted data, use the plain :ref:`json serializer <serialization-formats-json>`
|
|
instead.
|
|
|
|
In addition to the options of the ``json`` serializer, the ``geojson``
|
|
serializer accepts the following additional option when it is called by
|
|
``serializers.serialize()``:
|
|
|
|
* ``geometry_field``: A string containing the name of a geometry field to use
|
|
for the ``geometry`` key of the GeoJSON feature. This is only needed when you
|
|
have a model with more than one geometry field and you don't want to use the
|
|
first defined geometry field (by default, the first geometry field is picked).
|
|
|
|
* ``srid``: The SRID to use for the ``geometry`` content. Defaults to 4326
|
|
(WGS 84).
|
|
|
|
The :ref:`fields <subset-of-fields>` option can be used to limit fields that
|
|
will be present in the ``properties`` key, as it works with all other
|
|
serializers.
|
|
|
|
Example::
|
|
|
|
from django.core.serializers import serialize
|
|
from my_app.models import City
|
|
|
|
serialize('geojson', City.objects.all(),
|
|
geometry_field='point',
|
|
fields=('name',))
|
|
|
|
Would output::
|
|
|
|
{
|
|
'type': 'FeatureCollection',
|
|
'crs': {
|
|
'type': 'name',
|
|
'properties': {'name': 'EPSG:4326'}
|
|
},
|
|
'features': [
|
|
{
|
|
'type': 'Feature',
|
|
'geometry': {
|
|
'type': 'Point',
|
|
'coordinates': [-87.650175, 41.850385]
|
|
},
|
|
'properties': {
|
|
'name': 'Chicago'
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
When the ``fields`` parameter is not specified, the ``geojson`` serializer adds
|
|
a ``pk`` key to the ``properties`` dictionary with the primary key of the
|
|
object as the value.
|