Fixed bug with Meta.ordering being ignored when slicing a single item off a…

Fixed bug with Meta.ordering being ignored when slicing a single item off a QuerySet.  Thanks, Gábor Fawkes.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2970 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/base.py

@@ -269,8 +269,8 @@ class Model(object):
         q._params.extend([param, param, getattr(self, self._meta.pk.attname)])
         try:
             return q[0]
-        except IndexError, e:
-            raise self.DoesNotExist, e.args
+        except IndexError:
+            raise self.DoesNotExist, "%s matching query does not exist." % self.__class__._meta.object_name
 
     def _get_next_or_previous_in_order(self, is_next):
         cachename = "__%s_order_cache" % is_next

django/db/models/query.py

@@ -129,7 +129,7 @@ class QuerySet(object):
                     return list(self._clone(_offset=offset, _limit=limit))[::k.step]
             else:
                 try:
-                    return self._clone(_offset=k, _limit=1).get()
+                    return list(self._clone(_offset=k, _limit=1))[0]
                 except self.model.DoesNotExist, e:
                     raise IndexError, e.args
         else:
@@ -193,6 +193,7 @@ class QuerySet(object):
     def get(self, *args, **kwargs):
         "Performs the SELECT and returns a single object matching the given keyword arguments."
         clone = self.filter(*args, **kwargs)
+        # clean up SQL by removing unneeded ORDER BY
         if not clone._order_by:
             clone._order_by = ()
         obj_list = list(clone)

tests/modeltests/ordering/models.py

@@ -56,6 +56,10 @@ API_TESTS = """
 >>> Article.objects.order_by('headline')[1:3]
 [Article 2, Article 3]
 
+# Getting a single item should work too:
+>>> Article.objects.all()[0]
+Article 4
+
 # Use '?' to order randomly. (We're using [...] in the output to indicate we
 # don't know what order the output will be in.
 >>> Article.objects.order_by('?')