make the request user query unique (bug 587226)

apps/bandwagon/templates/bandwagon/includes/addedit.html

@@ -10,7 +10,7 @@
   <p>
     {{ form.errors['slug']|safe }}
     {{ form.slug.label|safe }}
-    {{ url('collections.user', user.get_profile().nickname)|absolutify -}}
+    {{ url('collections.user', amo_user.nickname)|absolutify -}}
     {{ form.slug|safe }}
   </p>
   <p>

apps/users/models.py

@@ -41,7 +41,8 @@ def create_password(algorithm, raw_password):
 class UserManager(amo.models.ManagerBase):
 
     def request_user(self):
-        return self.transform(UserProfile.request_user_transformer)
+        return (self.extra(select={'request': 1})
+                .transform(UserProfile.request_user_transformer))
 
 
 class UserProfile(amo.models.ModelBase):