before

gistfile1.rb

class CommentsController < ApplicationController
  def create
    event_user = EventUser.find(params[:event_user_id])
    comment = Comment.create(:event_user => event_user, :text => params[:text])
    FayeClient.broadcast("/event_#{event_user.event_id}_comments", comment.as_json)
    render :text => 'Success'
  end
end

##############################

class Comment < ActiveRecord::Base
  belongs_to :event_user
  attr_accessible :text, :event_user
  delegate :uid, :to => 'event_user.user'

  def as_json
    super.merge(:uid => uid, :text => ERB::Util.html_escape(text))
  end
end