Use explicit srid in get_queryset

When manually defining an srid for your geometry field, Django by default queries using the manually specified srid, resulting in an empty viewport even when items are in the viewport. This is caused by a difference in srid. When constructing the bounding-box Polygon, manually specify the srid to use, so Django won't query the database with a wrong srid.

djgeojson/tests.py

@@ -661,6 +661,29 @@ def test_simplification_takes_the_closest_upper_level(self):
         self.assertEqual(self.view.simplify, 200)
 
 
+class FixedSridPoint(models.Model):
+
+    geom = models.PointField(srid=28992)
+
+
+class TiledGeoJSONViewFixedSridTest(TestCase):
+    def setUp(self):
+        self.view = TiledGeoJSONLayerView(model=FixedSridPoint)
+        self.view.args = []
+        self.p1 = FixedSridPoint.objects.create(geom=Point(253286, 531490))
+        self.p2 = FixedSridPoint.objects.create(geom=Point(253442, 532897))
+
+    def test_within_viewport(self):
+        self.view.args = [12, 2125, 1338]
+        response = self.view.render_to_response(context={})
+        geojson = json.loads(smart_text(response.content))
+        self.assertEqual(len(geojson['features']), 2)
+        self.assertEqual(geojson['features'][0]['geometry']['coordinates'],
+                         [6.843322039261242, 52.76181518632031])
+        self.assertEqual(geojson['features'][1]['geometry']['coordinates'],
+                         [6.846053318324978, 52.77442791046052])
+
+
 class Address(models.Model):
     geom = GeoJSONField()
 

djgeojson/views.py

@@ -133,6 +133,7 @@ def get_queryset(self):
         se = self.tile_coord(self.x + 1, self.y + 1, self.z)
         bbox = Polygon((nw, (se[0], nw[1]),
                        se, (nw[0], se[1]), nw))
+        bbox.srid = self.srid
         qs = super(TiledGeoJSONLayerView, self).get_queryset()
         qs = qs.filter(**{
             '%s__intersects' % self.geometry_field: bbox