Change clear channel to not do a find-all before deleting feeds.

app/controllers/channels_controller.rb

@@ -38,7 +38,7 @@ class ChannelsController < ApplicationController
   # clear all data from a channel
   def clear
     channel = current_user.channels.find(params[:id])
-    channel.feeds.delete_all
+    channel.delete_feeds
     channel.update_attribute(:last_entry_id, nil)
 
     redirect_to channels_path

app/models/channel.rb

@@ -10,6 +10,7 @@ class Channel < ActiveRecord::Base
 
   after_create :set_initial_default_name
   before_validation :set_default_name
+  after_destroy :delete_feeds
   
   validates :name, :presence => true, :on => :update
 
@@ -22,7 +23,11 @@ class Channel < ActiveRecord::Base
   end
 
   def field_label(field_number)
-    self["field#{field_number}"]
+    self.attributes["field#{field_number}"]
+  end
+  
+  def delete_feeds
+    Feed.delete_all(["channel_id = ?", self.id])    
   end
 
 private