small fix

app/models/note.rb

@@ -92,7 +92,7 @@ def freshly_closed_until
   # Return the note's description, unless record is unavailable and
   # it will be derived from the first comment
   def description
-    if self[:user_ip].nil? && self[:user_id].nil?
+    if user_ip.nil? && user_id.nil?
       comments.first.body
     else
       RichText.new("text", self[:description])
@@ -107,20 +107,20 @@ def author
   # Return the note's author ID, unless record is unavailable and
   # it will be derived from the first comment
   def author_id
-    if self[:user_ip].nil? && self[:user_id].nil?
+    if user_ip.nil? && user_id.nil?
       comments.first.author_id
     else
-      self[:user_id]
+      user_id
     end
   end
 
   # Return the note's author IP address, unless record is unavailable and
   # it will be derived from the first comment
   def author_ip
-    if self[:user_ip].nil? && self[:user_id].nil?
+    if user_ip.nil? && user_id.nil?
       comments.first.author_ip
     else
-      self[:user_ip]
+      user_ip
     end
   end