changed post body column to text instead of string

db/migrate/20110808220246_create_posts_table.rb

@@ -1,7 +1,7 @@
 class CreatePostsTable < ActiveRecord::Migration
   def self.up
     create_table :posts, :force => true do |t|
-      t.string   :body
+      t.text   :body
       t.integer  :forum_id
       t.integer  :topic_id
       t.integer  :user_id