Add ActiveRecord subclassing

app/models/feed.rb

@@ -1,4 +1,4 @@
-class Feed
+class Feed < ActiveRecord::Base
   has_many :posts, :dependent => :destroy
 
   validates :title, :presence => true

app/models/post.rb

@@ -1,4 +1,4 @@
-class Post
+class Post < ActiveRecord::Base
   belongs_to :feed
   
   EARTH_RADIUS_M = 6378000

app/models/user.rb

@@ -1,4 +1,4 @@
-class User
+class User < ActiveRecord::Base
   authenticates_with_sorcery!
 #   attr_accessible :email, :password, :password_confirmation