can add member

app/models/user/attribute_field.rb

@@ -2,7 +2,7 @@ class AttributeField
   
   include Mongoid::Document
   include Mongoid::Timestamps
-  include AttributeFieldHelper
+  include ::AttributeFieldsHelper
 
   field :key
   field :markup 

app/models/user/user.rb

@@ -10,7 +10,7 @@ class User
   field :admin, :type => Boolean, :default => true
   field :active_role
   field :nccu_ldap_uid
-  
+  field :email
   # field :cache_dept
   # has_one :cache_dept, :class_name => "I18nVariable", :as => :language_value, :autosave => true, :dependent => :destroy
   field :cache_dept,type: Hash
@@ -37,6 +37,8 @@ class User
   before_save :check_status_record
   scope :remote_account, where(:nccu_id.ne => nil)
 
+  validates_uniqueness_of :email,:message=> I18n.t("devise.registrations.email_not_unique")
+
 
   def set_sub_role(sub_role_id,status_id)
     self.sub_roles << SubRole.find(sub_role_id)