Ticket #11557: django-get-latest-by-tuple.diff

django/db/models/query.py

@@ -353 +353 @@
                 "Cannot change a query once a slice has been taken."
         obj = self._clone()
         obj.query.set_limits(high=1)
-        obj.query.add_ordering('-%s' % latest_by)
+        if isinstance(latest_by, (list, tuple)):
+            for s in latest_by:
+                obj.query.add_ordering('-%s' % s)
+        else:
+            obj.query.add_ordering('-%s' % latest_by)
         return obj.get()
 
     def in_bulk(self, id_list):

tests/modeltests/get_latest/models.py

@@ -29 +29 @@
     def __unicode__(self):
         return self.name
 
+class Transaction(models.Model):
+    sort_order = models.IntegerField()
+    timestamp = models.DateTimeField()
+
+    class Meta:
+        ordering = ('sort_order', 'timestamp')
+        get_latest_by = ordering
+
+    def __unicode__(self):
+        return u'#%u: %s' % (self.id, self.timestamp)
+
 __test__ = {'API_TESTS':"""
 # Because no Articles exist yet, latest() raises ArticleDoesNotExist.
 >>> Article.objects.latest()
@@ -76 +87 @@
 
 >>> Person.objects.latest('birthday')
 <Person: Stephanie>
+
+>>> ts = datetime(2009, 7, 3, 17, 45, 30)
+>>> trans1 = Transaction.objects.create(timestamp = ts, sort_order = 1)
+>>> trans2 = Transaction.objects.create(timestamp = ts, sort_order = 2)
+>>> Transaction.objects.all()
+[<Transaction: #1: 2009-07-03 17:45:30>, <Transaction: #2: 2009-07-03 17:45:30>]
+>>> Transaction.objects.latest()
+<Transaction: #2: 2009-07-03 17:45:30>
+>>> trans1.sort_order = 3
+>>> trans1.save()
+>>> Transaction.objects.latest()
+<Transaction: #1: 2009-07-03 17:45:30>
 """}