Fixed #12481: Updated admin validation code to not reject non-editable fields in readonly_fields, since these are handled fine by the display code itself. Thanks lashni and Alex.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12730 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_validation/models.py

@@ -12,6 +12,7 @@ class Album(models.Model):
 class Song(models.Model):
     title = models.CharField(max_length=150)
     album = models.ForeignKey(Album)
+    original_release = models.DateField(editable=False)
 
     class Meta:
         ordering = ('title',)