change view and action for announcement ,Lin checked. Also add validation for object_auth make sure for each object,the object will be unique for each action.

app/models/object_auth.rb

@@ -1,5 +1,6 @@
 class ObjectAuth  < PrototypeAuth
   include OrbitCoreLib::ObjectTokenUnility
+  validates_uniqueness_of :obj_authable_type,:scope => :title #{ |c| }
   belongs_to :obj_authable, polymorphic: true
   # > - Something.find_with_auth(query)
   # > - or Something.find(query).auth