User.now_viewing group_by

Gemfile.lock

@@ -176,7 +176,7 @@ GEM
     gmail_xoauth (0.4.1)
       oauth (>= 0.3.6)
     gritter (1.1.0)
-    guard (2.8.1)
+    guard (2.8.2)
       formatador (>= 0.2.4)
       listen (~> 2.7)
       lumberjack (~> 1.0)
@@ -451,7 +451,7 @@ GEM
       rack (>= 1.0)
     webrobots (0.1.1)
     websocket (1.2.1)
-    websocket-driver (0.3.5)
+    websocket-driver (0.4.0)
     xpath (2.0.0)
       nokogiri (~> 1.3)
 

app/models/user.rb

@@ -56,7 +56,7 @@ class User < ActiveRecord::Base
 
   scope :post_today, -> { joins(:posts).where('posts.updated_at > ?', 1.day.ago) }
 
-  scope :now_viewing, -> { joins(:footprints).where('footprints.updated_at > ?', 10.minutes.ago) }
+  scope :now_viewing, -> { joins(:footprints).where('footprints.updated_at > ?', 10.minutes.ago).group('users.id') }
 
   ######################################################################
   # Validations