Fixed #8569 -- Ensure that apps are correctly set up before introspecting them

in admin validation.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8605 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/validation.py

@@ -17,6 +17,10 @@ def validate(cls, model):
     classmethod in the end if it is provided in cls. The signature of the
     custom validation classmethod should be: def validate(cls, model).
     """
+    # Before we can introspect models, they need to be fully loaded so that
+    # inter-relations are set up correctly. We force that here.
+    models.get_apps()
+
     opts = model._meta
     validate_base(cls, model)