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111 lines
4.3 KiB
Python
111 lines
4.3 KiB
Python
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
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from .models import City, MultiFields, PennsylvaniaCity
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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.order_by("name"))
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geodata = json.loads(geojson)
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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.order_by("name").first()
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self.assertEqual(geodata["features"][0]["id"], first_city.pk)
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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(),
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name="Name",
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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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)
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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", MultiFields.objects.all(), 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_id_field_option(self):
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"""
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By default Django uses the pk of the object as the id for a feature.
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The 'id_field' option can be used to specify a different field to use
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as the id.
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"""
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cities = City.objects.order_by("name")
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geojson = serializers.serialize("geojson", cities, id_field="name")
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geodata = json.loads(geojson)
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self.assertEqual(geodata["features"][0]["id"], cities[0].name)
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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(
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name="Mansfield", county="Tioga", point="POINT(-77.071445 41.823881)"
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)
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geojson = serializers.serialize(
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"geojson",
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PennsylvaniaCity.objects.all(),
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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(
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"geojson", City.objects.order_by("name"), srid=2847
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)
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geodata = json.loads(geojson)
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coordinates = geodata["features"][0]["geometry"]["coordinates"]
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# Different PROJ versions use different transformations, all are
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# correct as having a 1 meter accuracy.
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self.assertAlmostEqual(coordinates[0], 1564802, -1)
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self.assertAlmostEqual(coordinates[1], 5613214, -1)
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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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