many tiny changes

app/models/blogpost.rb

@@ -4,4 +4,12 @@ class Blogpost < ActiveRecord::Base
   belongs_to :user
   has_many :comments
   accepts_nested_attributes_for :comments
+
+  def author
+    @author ||= if user.present?
+      user
+    else
+      User.find_by_name("Deleted user")
+    end
+  end
 end

app/models/comment.rb

@@ -1,6 +1,10 @@
 class Comment < ActiveRecord::Base
   attr_accessible :text, :user, :blogpost, :post
+
   validates_presence_of :text, :user, :blogpost
+  validates_length_of :text, :in => 4..1000
+
+
   belongs_to :blogpost
   belongs_to :user
 end