Rails - Nov 2008 - upload an image

can anyone give me the code for upload an image,,i try
in various ways such as acts_as_attatchment plugin but
it wasn''t work..now im in a big trouble,,,plz give me another
solution to this

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the view:

	<% form_for(@user, :url => (@edition ? user_path() :
user_path), :method => :put, :html => {:multipart => true}) do |f|
%>
		<%= f.file_field(:user_image_file) %><br />
		<%= submit_tag(''Save'') %>
	<% end %>

in the controller:

    if params[:user][:user_image_file] then
      @user.upload_image
    end

the model:

  def upload_image
    if user_image_file && user_image_file != "" then
      file = user_image_file
      write_attribute(:image_mime_type,
MIME::Types.type_for(file.original_filename).to_s.gsub(''image/'',
''''))
      File.open(File.join(IMAGE_FILE_LOCATION,
image_filename(:original)), ''wb'') { |f| f.write(file.read) }

      save
    end
  end

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