refactored favorites

app/models/favorite.rb

@@ -6,4 +6,26 @@ class Favorite < ActiveRecord::Base
   def self.destroy_all(hash)
     connection.execute("delete from favorites_#{hash[:user_id] % 100} where user_id = #{hash[:user_id]} and post_id = #{hash[:post_id]}")
   end
+
+  def self.add(post, user)
+    return if Favorite.for_user(user.id).exists?(:user_id => user.id, :post_id => post.id)
+    Favorite.create(:user_id => user.id, :post_id => post.id)
+    Post.update_all("fav_count = fav_count + 1", "id = #{post.id}")
+    Post.update_all("score = score + 1", "id = #{post.id}") if user.is_privileged?
+    post.append_user_to_fav_string(user.id)
+    user.add_favorite!(post)
+    user.increment!(:favorite_count)
+    post.add_favorite!(user)
+  end
+
+  def self.remove(post, user)
+    return unless Favorite.for_user(user.id).exists?(:user_id => user.id, :post_id => post.id)
+    Favorite.destroy_all(:user_id => user.id, :post_id => post.id)
+    Post.update_all("fav_count = fav_count - 1", "id = #{post.id}")
+    Post.update_all("score = score - 1", "id = #{post.id}") if user.is_privileged?
+    post.delete_user_from_fav_string(user.id)
+    user.remove_favorite!(post)
+    user.decrement!(:favorite_count)
+    post.remove_favorite!(user)
+  end
 end