diff --git a/app/models/user.rb b/app/models/user.rb
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -22,6 +22,8 @@
            :class_name => "Message",
            :foreign_key => "receiver_id"
 
+  has_many :logins
+
   has_one :contest_stat, :class_name => "UserContestStat", :dependent => :destroy
 
   belongs_to :site