Rails - Nov 2006 - uploding files

i am trying to upload the files for that i have used the below code.when 
i try to upload i shows the error message that access denied for 
c/rails/.../dump please kindly help me

 controller:

class DocumentsController < ApplicationController
  before_filter :login_required
	model :user
	after_filter OutputCompressionFilter



  def index
    new
    render :action => ''new''
  end

   #GETs should be safe (see 
http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method => :post, :only => [ :destroy, :new, :update ],
       :redirect_to => { :action => :list }
def cancel
  redirect_to :controller => ''account/welcome''
  flash[:notice] = ''document not uploaded''
  end

def new
   if request.get?
      @document = Document.new
   else
   @document = Document.new(params[:document])
      begin
        if @document.save
          flash[:notice] = ''document uploaded''
          redirect_to :action => ''list''
        end
      rescue
        logger.error("Error while saving document containing 
''#{@document.filename}''")
        if File.unlink(@document.dump_filename) == 1
         logger.error("Cleanup of
''#{@document.dump_filename}''
successful")
        else
         logger.error("Cleanup of
''#{@document.dump_filename}'' failed")
        end
        flash[:notice] = ''Internal error during upload.''
        redirect_to :action => ''list''
      end
    end
  end
#def list
    #@document_pages, @document = paginate :document, :per_page => 10
  #end
  def list
    @document = Document.find(:all, :order => ''uploaddate'')
  end
#def view
		#@user = get_user
		#@pages = @user.pages
		#@page = @pages.find(params[:id])
	#end

  def show
    @document = Document.find(params[:id])
  end


  def edit
    @document = Document.find(params[:id])
  end

  def update
    @document = Document.find(params[:id])
    if @document.update_attributes(params[:document])
      flash[:notice] = ''document was successfully updated.''
      redirect_to :action => ''show'', :id => @document
    else
      render :action => ''edit''
    end
  end

  def destroy
   @document = Document.find(params[:id]).destroy
    redirect_to :action => ''list''
  end
end

model:

class Document < ActiveRecord::Base
  attr_accessible :description, :file
  validates_presence_of :filename
  has_and_belongs_to_many :bundles, :uniq => true
  has_and_belongs_to_many :categories, :uniq => true

  def file=(file_field)
    @file = file_field
   original_filename = file_field.original_filename
    logger.info("Original filename is
''#{original_filename}''")
    self.filename = base_document_of(original_filename)
    logger.info("Sanitized filename is
''#{self.filename}''")
   # self.content_type = file_field.content_type.strip
  end

 def orginal_filename
   end
  def validate_on_create
    if @file.size <= 0
      errors.add_to_base("File size is invalid")
    end
  end

  def before_create
    filename = dump_filename
    logger.info("Uploading file to ''#{filename}''")
    @file.rewind
    File.open(filename, "wb") do |f|
      f.write(@file.read)
    end
  end

  def dump_filename
    # DUMP_PATH is set in config/environment.rb
    File.expand_path(File.join(DUMP_PATH, "#{self.filename}"))
  end

  private
  def base_document_of(filename)
    filename = File.basename(filename.strip)
    # remove leading period, whitespace and \ / : * ? " '' <
> |
    filename = filename.gsub(%r{^\.|[\s/\\\*\:\?''"<>\|]},
''_'')
  end
end

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