Hide diary entries and comments made by deleted users.

app/models/diary_entry.rb

@@ -1,6 +1,8 @@
 class DiaryEntry < ActiveRecord::Base
   belongs_to :user
-  has_many :diary_comments, :order => "id"
+  has_many :diary_comments, :include => :user,
+                            :conditions => "users.visible = 1",
+                            :order => "id"
 
   validates_presence_of :title, :body
   validates_numericality_of :latitude, :allow_nil => true