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97 lines
3.8 KiB
Python
97 lines
3.8 KiB
Python
from __future__ import unicode_literals
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import json
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from django.contrib.gis.geos import LinearRing, Point, Polygon
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from django.core import serializers
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from django.test import TestCase, skipUnlessDBFeature
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from .models import City, MultiFields, PennsylvaniaCity
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@skipUnlessDBFeature("gis_enabled")
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class GeoJSONSerializerTests(TestCase):
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fixtures = ['initial']
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def test_builtin_serializers(self):
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"""
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'geojson' should be listed in available serializers.
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"""
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all_formats = set(serializers.get_serializer_formats())
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public_formats = set(serializers.get_public_serializer_formats())
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self.assertIn('geojson', all_formats),
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self.assertIn('geojson', public_formats)
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def test_serialization_base(self):
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geojson = serializers.serialize('geojson', City.objects.all().order_by('name'))
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try:
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geodata = json.loads(geojson)
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except Exception:
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self.fail("Serialized output is not valid JSON")
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self.assertEqual(len(geodata['features']), len(City.objects.all()))
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self.assertEqual(geodata['features'][0]['geometry']['type'], 'Point')
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self.assertEqual(geodata['features'][0]['properties']['name'], 'Chicago')
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first_city = City.objects.all().order_by('name').first()
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self.assertEqual(geodata['features'][0]['properties']['pk'], str(first_city.pk))
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def test_geometry_field_option(self):
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"""
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When a model has several geometry fields, the 'geometry_field' option
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can be used to specify the field to use as the 'geometry' key.
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"""
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MultiFields.objects.create(
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city=City.objects.first(), name='Name', point=Point(5, 23),
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poly=Polygon(LinearRing((0, 0), (0, 5), (5, 5), (5, 0), (0, 0))))
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geojson = serializers.serialize('geojson', MultiFields.objects.all())
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geodata = json.loads(geojson)
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self.assertEqual(geodata['features'][0]['geometry']['type'], 'Point')
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geojson = serializers.serialize(
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'geojson',
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MultiFields.objects.all(),
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geometry_field='poly'
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)
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geodata = json.loads(geojson)
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self.assertEqual(geodata['features'][0]['geometry']['type'], 'Polygon')
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# geometry_field is considered even if not in fields (#26138).
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geojson = serializers.serialize(
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'geojson',
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MultiFields.objects.all(),
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geometry_field='poly',
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fields=('city',)
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)
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geodata = json.loads(geojson)
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self.assertEqual(geodata['features'][0]['geometry']['type'], 'Polygon')
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def test_fields_option(self):
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"""
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The fields option allows to define a subset of fields to be present in
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the 'properties' of the generated output.
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"""
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PennsylvaniaCity.objects.create(name='Mansfield', county='Tioga', point='POINT(-77.071445 41.823881)')
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geojson = serializers.serialize(
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'geojson', PennsylvaniaCity.objects.all(), fields=('county', 'point'),
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)
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geodata = json.loads(geojson)
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self.assertIn('county', geodata['features'][0]['properties'])
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self.assertNotIn('founded', geodata['features'][0]['properties'])
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self.assertNotIn('pk', geodata['features'][0]['properties'])
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def test_srid_option(self):
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geojson = serializers.serialize('geojson', City.objects.all().order_by('name'), srid=2847)
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geodata = json.loads(geojson)
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self.assertEqual(
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[int(c) for c in geodata['features'][0]['geometry']['coordinates']],
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[1564802, 5613214]
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)
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def test_deserialization_exception(self):
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"""
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GeoJSON cannot be deserialized.
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"""
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with self.assertRaises(serializers.base.SerializerDoesNotExist):
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serializers.deserialize('geojson', '{}')
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