Fixed a problem when computing deferred fields on multiple related models.

Fixed #10710, as this fixes the second bug reported there.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10384 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/sql/query.py

@@ -574,12 +574,13 @@ class BaseQuery(object):
         if not field_names:
             return
         columns = set()
-        cur_model = self.model
-        opts = cur_model._meta
+        orig_opts = self.model._meta
         seen = {}
-        must_include = {cur_model: set([opts.pk])}
+        must_include = {self.model: set([orig_opts.pk])}
         for field_name in field_names:
             parts = field_name.split(LOOKUP_SEP)
+            cur_model = self.model
+            opts = orig_opts
             for name in parts[:-1]:
                 old_model = cur_model
                 source = opts.get_field_by_name(name)[0]

tests/regressiontests/defer_regress/models.py

@@ -24,6 +24,7 @@ class Child(models.Model):
 class Leaf(models.Model):
     name = models.CharField(max_length=10)
     child = models.ForeignKey(Child)
+    second_child = models.ForeignKey(Child, related_name="other", null=True)
     value = models.IntegerField(default=42)
 
     def __unicode__(self):
@@ -87,6 +88,8 @@ Some further checks for select_related() and inherited model behaviour
 >>> obj = Leaf.objects.only("name", "child").select_related()[0]
 >>> obj.child.name
 u'c1'
+>>> Leaf.objects.select_related().only("child__name", "second_child__name")
+[<Leaf_Deferred_name_value: l1>]
 
 """
 }