Cropping question

gistfile1.rb

################ tattoo.rb #################

class Tattoo < ActiveRecord::Base
  attr_accessor :crop_x, :crop_y, :crop_w, :crop_h
  attr_accessible :name, :image, :user_id

  has_many :comments
  belongs_to :user

  has_attached_file :image, styles: { :thumb => "200x150>", :normal => "600x450>", :large => "600x600>" }, :processors => [:cropper]

  after_update :reprocess_image, if: :cropping?
  
  def self.recent
    order('created_at desc')
  end

  def self.search(keywords)
    tattoos = recent
    tattoos = tattoos.where("name like ?", "%#{keywords}%") if keywords.present?
    tattoos
  end
  
  def cropping?
    !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank?
  end
  
  def image_geometry(style = :original)
    @geometry ||= {}
    @geometry[style] ||= Paperclip::Geometry.from_file(image.path(style))
  end
  
  private
  
  def reprocess_image
    image.reprocess!
  end
end

############ tattoos_controller.rb ###############

class TattoosController < ApplicationController

  def index
    @tattoos = Tattoo.search(params[:search])
  end

  def new
    @tattoo = Tattoo.new
  end

  def create
    @tattoo = Tattoo.new(params[:tattoo])
    if @tattoo.save
      current_user.tattoos << @tattoo
      render :crop
    else
      flash.now.alert = 'Sorry there was an error uploading your Tattu'
      render 'new'
    end
  end

  def show
    @tattoo = Tattoo.find(params[:id])
    @comment = Comment.new
    @comments = @tattoo.comments
  end
  
  def update
    @tattoo = Tattoo.find(params[:id])
    if @tattoo.update_attributes(params[:tattoo])
      if params[:tattoo][:image].present?
        render :crop
      else
        redirect_to @tattoo, notice: 'Successfully updated Tattu'
      end
    else
      render 'new'
    end
  end
end

############## crop.html.erb ###############

<h2>Crop Tattoo</h2>

<%= image_tag @tattoo.image.url(:large), id: "cropbox" %>

<%= form_for @tattoo do |f| %>
  <% %w[x y w h].each do |attribute| %>
    <%= f.hidden_field "crop_#{attribute}" %><br>
  <% end %>
  <div class="actions">
    <%= f.submit "Crop Image" %>
  </div>
<% end %>