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- from django.apps import apps
- from django.contrib.gis.db.models.fields import GeometryField
- from django.contrib.gis.db.models.functions import AsKML, Transform
- from django.contrib.gis.shortcuts import render_to_kml, render_to_kmz
- from django.core.exceptions import FieldDoesNotExist
- from django.db import DEFAULT_DB_ALIAS, connections
- from django.http import Http404
-
-
- def kml(request, label, model, field_name=None, compress=False, using=DEFAULT_DB_ALIAS):
- """
- This view generates KML for the given app label, model, and field name.
-
- The field name must be that of a geographic field.
- """
- placemarks = []
- try:
- klass = apps.get_model(label, model)
- except LookupError:
- raise Http404('You must supply a valid app label and module name. Got "%s.%s"' % (label, model))
-
- if field_name:
- try:
- field = klass._meta.get_field(field_name)
- if not isinstance(field, GeometryField):
- raise FieldDoesNotExist
- except FieldDoesNotExist:
- raise Http404('Invalid geometry field.')
-
- connection = connections[using]
-
- if connection.features.has_AsKML_function:
- # Database will take care of transformation.
- placemarks = klass._default_manager.using(using).annotate(kml=AsKML(field_name))
- else:
- # If the database offers no KML method, we use the `kml`
- # attribute of the lazy geometry instead.
- placemarks = []
- if connection.features.has_Transform_function:
- qs = klass._default_manager.using(using).annotate(
- **{'%s_4326' % field_name: Transform(field_name, 4326)})
- field_name += '_4326'
- else:
- qs = klass._default_manager.using(using).all()
- for mod in qs:
- mod.kml = getattr(mod, field_name).kml
- placemarks.append(mod)
-
- # Getting the render function and rendering to the correct.
- if compress:
- render = render_to_kmz
- else:
- render = render_to_kml
- return render('gis/kml/placemarks.kml', {'places': placemarks})
-
-
- def kmz(request, label, model, field_name=None, using=DEFAULT_DB_ALIAS):
- """
- Return KMZ for the given app label, model, and field name.
- """
- return kml(request, label, model, field_name, compress=True, using=using)
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