Replaced some GIS has_X_method skips with supports_X_aggr/has_X_function.

django/contrib/gis/db/backends/base/features.py

@@ -82,7 +82,7 @@ class BaseSpatialFeatures(object):
         'svg', 'sym_difference', 'transform', 'translate', 'union', 'unionagg',
     )
 
-    # Specifies whether the Collect and Extent aggregates are supported by the database
+    # Is the aggregate supported by the database?
     @property
     def supports_collect_aggr(self):
         return aggregates.Collect not in self.connection.ops.disallowed_aggregates
@@ -95,6 +95,10 @@ class BaseSpatialFeatures(object):
     def supports_make_line_aggr(self):
         return aggregates.MakeLine not in self.connection.ops.disallowed_aggregates
 
+    @property
+    def supports_union_aggr(self):
+        return aggregates.Union not in self.connection.ops.disallowed_aggregates
+
     def __init__(self, *args):
         super(BaseSpatialFeatures, self).__init__(*args)
         for method in self.geoqueryset_methods:

tests/gis_tests/distapp/tests.py

@@ -312,7 +312,7 @@ class DistanceTest(TestCase):
         # instead (we should get the same results b/c accuracy variance won't matter
         # in this test case).
         querysets = [qs1]
-        if connection.features.has_distance_spheroid_method:
+        if connection.features.has_DistanceSpheroid_function:
             gq3 = Q(point__distance_lte=(wollongong.point, d1, 'spheroid'))
             gq4 = Q(point__distance_gte=(wollongong.point, d2, 'spheroid'))
             qs2 = AustraliaCity.objects.exclude(name='Wollongong').filter(gq3 | gq4)

tests/gis_tests/geoapp/tests.py

@@ -864,7 +864,7 @@ class GeoQuerySetTest(TestCase):
                         self.assertAlmostEqual(c1[0] + xfac, c2[0], 5)
                         self.assertAlmostEqual(c1[1] + yfac, c2[1], 5)
 
-    @skipUnlessDBFeature("has_unionagg_method")
+    @skipUnlessDBFeature('supports_union_aggr')
     def test_unionagg(self):
         """
         Testing the `Union` aggregate.

tests/gis_tests/relatedapp/tests.py

@@ -98,7 +98,7 @@ class RelatedGeoModelTest(TestCase):
             tol
         )
 
-    @skipUnlessDBFeature("has_unionagg_method")
+    @skipUnlessDBFeature('supports_union_aggr')
     def test_related_union_aggregate(self):
         "Testing the `Union` aggregate on related geographic models."
         # This combines the Extent and Union aggregates into one query