Rails - Jul 2006 - Multiple File Upload

Hello together,

I developed a file upload in my application like this (files uploaded 
belong to a project):

project_controller.rb:
----------------------
def upload_attachment
	project = Project.find(@params[:id])
	begin
		project.attachments.create(params[:attachment])
	rescue
		flash[:attachment_error] = "Error at Upload"
	end
	redirect_to :action => "edit_project", :id => project
end

attachment_model:
-----------------
def attachment=(attachment_field)
	self.name = base_part_of(attachment_field.original_filename)
	self.content_type = attachment_field.content_type.chomp
	self.data = attachment_field.read
end

def base_part_of file_name
	name = File.basename(file_name)
	name.gsub(/[^\w._-]/, '''')
end

edit_project.rhtml:
-------------------
<%= form_tag({:action => ''upload_attachment'', :id =>
@project},
:multipart => true ) %>
 <input id="project_id" name="project[id]"
type="hidden" value="<%=
@project.id %>" />
 Title: <%= text_field("attachment","title") %> <%=
file_field("attachment","attachment") %><br/>
 <%= submit_tag ("Upload") %>
 <%= end_form_tag %>


Now the PROBLEM: What have I to write to get a multiple file upload, for 
example 5 files with one click on the Upload-Button. Is there anyone who 
knows something?

Thank you very much!

My english is not the best, but I hope everything is understandable - if 
not, please ask.

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