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@@ -15,6 +15,9 @@
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 class Comment < ActiveRecord::Base
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   include ActivityLogger
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-  validates_presence_of :body
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+  validates_presence_of :body, :commenter
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+  belongs_to :commentable, :polymorphic => true
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+  belongs_to :commenter, :class_name => "Person",
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+                         :foreign_key => "commenter_id"
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   has_many :activities, :foreign_key => "item_id", :dependent => :destroy
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 end

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@@ -41,9 +41,9 @@ class Person < ActiveRecord::Base
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   NUM_RECENT = 8
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   FEED_SIZE = 10
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-  has_one :blog  
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-  has_many :comments, :class_name => "WallComment",
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-                      :order => "created_at DESC", :limit => NUM_WALL_COMMENTS
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+  has_one :blog
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+  has_many :comments, :as => :commentable, :order => 'created_at DESC',
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+                      :limit => NUM_WALL_COMMENTS
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   has_many :connections
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   has_many :contacts, :through => :connections,
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                       :conditions => "status = #{Connection::ACCEPTED}"

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@@ -1,17 +1,15 @@
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 class CreateComments < ActiveRecord::Migration
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   def self.up
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     create_table :comments do |t|
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-      t.integer :person_id
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       t.integer :commenter_id
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-      t.integer :blog_post_id
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-      t.text :body
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-      t.string :type
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+      t.integer :commentable_id
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+      t.string  :commentable_type, :default => "", :null => false
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+      t.text    :body
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       t.timestamps
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     end
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-    add_index :comments, :person_id
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     add_index :comments, :commenter_id
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-    add_index :comments, :type
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+    add_index :comments, [:commentable_id, :commentable_type]
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   end
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   def self.down