File upload and permissions

Hi.

I upload a file with this model :

class Match < ActiveRecord::Base
belongs_to :contest
belongs_to :user
has_many :comments

def replay=(uploaded_file)
@uploaded_file = uploaded_file
@filename = sanitize_filename(@uploaded_file.original_filename)
end

def after_create
if !File.exists?(File.dirname(self.path_to_file))
FileUtils.mkdir_p(File.dirname(self.path_to_file))
end
if @uploaded_file.instance_of?(Tempfile)
FileUtils.copy(@uploaded_file.local_path, self.path_to_file)
else
File.open(self.path_to_file, “wb”) { |f|
f.write(@uploaded_file.read) }
File.chmod(755, self.path_to_file)
end
write_attribute(:replay, self.path_to_file)
self.save
end

def after_destroy
if File.exists?(self.replay)
File.delete(self.replay)
Dir.rmdir(File.dirname(self.replay))
end
end

def simple_path
“/files/#{self.id}/#{sanitize_filename(self.replay)}”
end

def path_to_file
File.expand_path("#{RAILS_ROOT}/public/files/#{self.id}/
#{@filename}")
end

private
def sanitize_filename(file_name)
# get only the filename, not the whole path (from IE)
just_filename = File.basename(file_name)
# replace all none alphanumeric, underscore or perioids with
underscore
just_filename.gsub(/[^\w._]/,’_’)
end
end

The problem is that I can’t download the file. The FileUtils.chmod
won’t work.
I use apache/passenger.

the file directory :
drwxrwxr-x 4 www-data sobert 4096 oct 16 13:39 files

and in file directory :
drwxr-xr-x 2 sobert sobert 4096 oct 16 13:43 13

and in 13 directory :
-rw------- 1 sobert sobert 275955 oct 16 13:43
Arakan_Citadel_54_mins.SC2Replay

How to set the permissions right In order to allow download ?

Thanks !