[1.0.X] Fixed #10839 -- GeoQuery now unpickles properly on Oracle.

Backport of r10615 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10616 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/db/models/sql/query.py

@@ -30,6 +30,13 @@ class GeoQuery(sql.Query):
         self.transformed_srid = None
         self.extra_select_fields = {}
 
+    if SpatialBackend.oracle:
+        # Have to override this so that GeoQuery, instead of OracleQuery,
+        # is returned when unpickling.
+        def __reduce__(self):
+            callable, args, data = super(GeoQuery, self).__reduce__()
+            return (unpickle_geoquery, (), data)
+
     def clone(self, *args, **kwargs):
         obj = super(GeoQuery, self).clone(*args, **kwargs)
         # Customized selection dictionary and transformed srid flag have
@@ -324,6 +331,15 @@ class GeoQuery(sql.Query):
             # a lookup to a _related_ geographic field.
             return self._check_geo_field(self.model, field_name)
 
+if SpatialBackend.oracle:
+    def unpickle_geoquery():
+        """
+        Utility function, called by Python's unpickling machinery, that handles
+        unpickling of GeoQuery subclasses of OracleQuery.
+        """
+        return GeoQuery.__new__(GeoQuery)
+    unpickle_geoquery.__safe_for_unpickling__ = True
+
 ### Field Classes for `convert_values` ####
 class BaseField(object):
     def get_internal_type(self):

django/contrib/gis/tests/relatedapp/tests.py

@@ -137,6 +137,15 @@ class RelatedGeoModelTest(unittest.TestCase):
             self.assertEqual(val_dict['id'], c_id)
             self.assertEqual(val_dict['location__id'], l_id)
 
+    def test11_geoquery_pickle(self):
+        "Ensuring GeoQuery objects are unpickled correctly.  See #10839."
+        import pickle
+        from django.contrib.gis.db.models.sql import GeoQuery
+        qs = City.objects.all()
+        q_str = pickle.dumps(qs.query)
+        q = pickle.loads(q_str)
+        self.assertEqual(GeoQuery, q.__class__)
+
     # TODO: Related tests for KML, GML, and distance lookups.
         
 def suite():