Trying to override "rate" to not save a rating. From letsrate gem.

letsrate.js

$.fn.raty.defaults.path = "/assets";
$.fn.raty.defaults.half_show = true;

$(function(){
  $(".star").each(function() {
    var $readonly = ($(this).attr('data-readonly') == 'true');
    $(this).raty({
      score: function(){
        return $(this).attr('data-rating')
      },
      number: function() {
        return $(this).attr('data-star-count')
      },
      readOnly: $readonly,
      click: function(score, evt) {
        var _this = this;
        $.post('<%= Rails.application.class.routes.url_helpers.rate_path %>',
        {
          score: score,
          dimension: $(this).attr('data-dimension'),
          id: $(this).attr('data-id'),
          klass: $(this).attr('data-classname')
        },
        function(data) {
          if(data) {
            // success code goes here ...

            if ($(_this).attr('data-disable-after-rate') == 'true') {
              $(_this).raty('set', { readOnly: true, score: score });
            }
          }
        });
  	  }
    });
	});
});

rater_controller.rb

class RaterController < ApplicationController 
  
  def create                                  
    if current_user.present?
      obj = eval "#{params[:klass]}.find(#{params[:id]})"     
      if params[:dimension].present?
        obj.rate params[:score].to_i, current_user.id, "#{params[:dimension]}"       
      else
        obj.rate params[:score].to_i, current_user.id 
      end
      
      render :json => true 
    else
      render :json => false        
    end
  end                                        
  
  
end

ratings_helper.rb

module RatingsHelper


  def rate(stars, user_id, dimension=nil)
    if can_rate? user_id, dimension
      r = rates(dimension).build
      r.stars = stars
      r.rater_id = user_id
    else
      raise "User has already rated."
    end
  end

.
.
.
.

server_output.txt

Started POST "/rate" for 127.0.0.1 at 2013-06-16 14:22:37 -0500
Processing by RaterController#create as */*

  Parameters: {"score"=>"3", "dimension"=>"manner", "id"=>"1", "klass"=>"Doctor"}
  User Load (0.1ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 3 LIMIT 1
  Doctor Load (0.1ms)  SELECT "doctors".* FROM "doctors" WHERE "doctors"."id" = ? LIMIT 1  [["id", 1]]
   (0.1ms)  select count(*) as cnt from rates where rateable_id=1 and rateable_type='Doctor' and rater_id=3 and dimension='manner'
   (0.1ms)  begin transaction
  SQL (0.5ms)  INSERT INTO "rates" ("created_at", "dimension", "rateable_id", "rateable_type", "rater_id", "stars", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?)  [["created_at", Sun, 16 Jun 2013 19:22:37 UTC +00:00], ["dimension", "manner"], ["rateable_id", 1], ["rateable_type", "Doctor"], ["rater_id", 3], ["stars", 3.0], ["updated_at", Sun, 16 Jun 2013 19:22:37 UTC +00:00]]
   (2.3ms)  commit transaction
  RatingCache Load (0.2ms)  SELECT "rating_caches".* FROM "rating_caches" WHERE "rating_caches"."cacheable_id" = 1 AND "rating_caches"."cacheable_type" = 'Doctor' AND "rating_caches"."dimension" = 'manner' LIMIT 1
   (0.0ms)  begin transaction
  SQL (0.4ms)  INSERT INTO "rating_caches" ("avg", "cacheable_id", "cacheable_type", "created_at", "dimension", "qty", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?)  [["avg", 3.0], ["cacheable_id", 1], ["cacheable_type", "Doctor"], ["created_at", Sun, 16 Jun 2013 19:22:37 UTC +00:00], ["dimension", "manner"], ["qty", 1], ["updated_at", Sun, 16 Jun 2013 19:22:37 UTC +00:00]]
   (2.2ms)  commit transaction
   (0.1ms)  begin transaction
   (0.0ms)  commit transaction
Completed 200 OK in 60ms (Views: 0.2ms | ActiveRecord: 6.9ms)