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Code Issues Releases Wiki Activity

Added error messages for GIS DB functions when used with rasters.

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This commit is contained in:
Daniel Wiesmann 2016-08-15 18:21:12 +01:00 committed by Tim Graham
parent d6b9aab37c
commit 082f5bfdbc
2 changed files with 22 additions and 1 deletions
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7
django/contrib/gis/db/models/functions.py
View File

@ -1,7 +1,8 @@
from decimal import Decimal
from django.contrib.gis.db.models.fields import GeometryField
from django.contrib.gis.db.models.fields import GeometryField, RasterField
from django.contrib.gis.db.models.sql import AreaField
from django.contrib.gis.geometry.backend import Geometry
from django.contrib.gis.measure import (
Area as AreaMeasure, Distance as DistanceMeasure,
)
@ -40,6 +41,8 @@ class GeoFunc(Func):
def as_sql(self, compiler, connection):
if self.function is None:
self.function = connection.ops.spatial_function_name(self.name)
if any(isinstance(field, RasterField) for field in self.get_source_fields()):
raise TypeError("Geometry functions not supported for raster fields.")
return super(GeoFunc, self).as_sql(compiler, connection)
def resolve_expression(self, *args, **kwargs):
@ -87,6 +90,8 @@ class GeomValue(Value):
class GeoFuncWithGeoParam(GeoFunc):
def __init__(self, expression, geom, *expressions, **extra):
if not isinstance(geom, Geometry):
raise TypeError("Please provide a geometry object.")
if not hasattr(geom, 'srid') or not geom.srid:
raise ValueError("Please provide a geometry attribute with a defined SRID.")
super(GeoFuncWithGeoParam, self).__init__(expression, GeomValue(geom), *expressions, **extra)

16
tests/gis_tests/rasterapp/test_rasterfield.py
View File

@ -1,5 +1,6 @@
import json
from django.contrib.gis.db.models.functions import Distance
from django.contrib.gis.db.models.lookups import (
DistanceLookupBase, gis_lookups,
)
@ -326,3 +327,18 @@ class RasterFieldTest(TransactionTestCase):
msg = "Couldn't create spatial object from lookup value '%s'." % obj
with self.assertRaisesMessage(ValueError, msg):
RasterModel.objects.filter(geom__intersects=obj)
def test_db_function_errors(self):
"""
Errors are raised when using DB functions with raster content.
"""
point = GEOSGeometry("SRID=3086;POINT (-697024.9213808845 683729.1705516104)")
rast = GDALRaster(json.loads(JSON_RASTER))
msg = "Please provide a geometry object."
with self.assertRaisesMessage(TypeError, msg):
RasterModel.objects.annotate(distance_from_point=Distance("geom", rast))
with self.assertRaisesMessage(TypeError, msg):
RasterModel.objects.annotate(distance_from_point=Distance("rastprojected", rast))
msg = "Geometry functions not supported for raster fields."
with self.assertRaisesMessage(TypeError, msg):
RasterModel.objects.annotate(distance_from_point=Distance("rastprojected", point)).count()