def test_make_line(self):
"""
Testing the (deprecated) `make_line` GeoQuerySet method and the MakeLine
aggregate.
"""
if not connection.features.supports_make_line_aggr:
# Only PostGIS has support for the MakeLine aggregate. For other
# backends, test that NotImplementedError is raised
self.assertRaises(NotImplementedError,
City.objects.all().aggregate, MakeLine('point'))
return
# Ensuring that a `TypeError` is raised on models without PointFields.
self.assertRaises(TypeError, State.objects.make_line)
self.assertRaises(TypeError, Country.objects.make_line)
# MakeLine on an inappropriate field returns simply None
self.assertIsNone(
State.objects.aggregate(MakeLine('poly'))['poly__makeline'])
# Reference query:
# SELECT AsText(ST_MakeLine(geoapp_city.point)) FROM geoapp_city;
ref_line = GEOSGeometry(
'LINESTRING(-95.363151 29.763374,-96.801611 32.782057,'
'-97.521157 34.464642,174.783117 -41.315268,-104.609252 38.255001,'
'-95.23506 38.971823,-87.650175 41.850385,-123.305196 48.462611)',
srid=4326)
# We check for equality with a tolerance of 10e-5 which is a lower bound
# of the precisions of ref_line coordinates
line1 = City.objects.make_line()
line2 = City.objects.aggregate(MakeLine('point'))['point__makeline']
for line in (line1, line2):
self.assertTrue(ref_line.equals_exact(line, tolerance=10e-5),
"%s != %s" % (ref_line, line))
def test_make_line(self):
"""
Testing the `MakeLine` aggregate.
"""
if not connection.features.supports_make_line_aggr:
with self.assertRaises(NotSupportedError):
City.objects.all().aggregate(MakeLine('point'))
return
# MakeLine on an inappropriate field returns simply None
self.assertIsNone(State.objects.aggregate(MakeLine('poly'))['poly__makeline'])
# Reference query:
# SELECT AsText(ST_MakeLine(geoapp_city.point)) FROM geoapp_city;
ref_line = GEOSGeometry(
'LINESTRING(-95.363151 29.763374,-96.801611 32.782057,'
'-97.521157 34.464642,174.783117 -41.315268,-104.609252 38.255001,'
'-95.23506 38.971823,-87.650175 41.850385,-123.305196 48.462611)',
srid=4326
)
# We check for equality with a tolerance of 10e-5 which is a lower bound
# of the precisions of ref_line coordinates
line = City.objects.aggregate(MakeLine('point'))['point__makeline']
self.assertTrue(
ref_line.equals_exact(line, tolerance=10e-5),
"%s != %s" % (ref_line, line)
)