Added ability to change user roles in admin/users index

app/policies/admin/user_policy.rb

@@ -1,2 +1,7 @@
 class Admin::UserPolicy < ApplicationPolicy
+  skip_pre_check :allow_admins, only: :change_role?
+
+  def change_role?
+    user.admin? and user != record
+  end
 end

app/policies/application_policy.rb

@@ -1,6 +1,6 @@
 # Base class for application policies
 class ApplicationPolicy < ActionPolicy::Base
-  pre_check :allow_admins, :only_verified_users
+  pre_check :allow_admins, :deny_verified_users
 
   # admin is good! :)
   def allow_admins
@@ -8,7 +8,7 @@ class ApplicationPolicy < ActionPolicy::Base
   end
 
   # no email verification no rights
-  def only_verified_users
+  def deny_verified_users
     deny! unless user.verified?
   end