flexonrails.net

Here is the AS3:

private var fileRef:FileReference = new FileReference();
private function uploadFile():void
{
 fileRef.addEventListener(Event.SELECT, selectHandler);
 fileRef.addEventListener(Event.COMPLETE, completeHandler); 

try {
      var success:Boolean = fileRef.browse();
 } catch (error:Error) {
      trace("Unable to browse for files.");
  }
}
private function selectHandler(event:Event):void {

    // assumes the Ruby Method is in the application controller
    var request:URLRequest = new URLRequest("application/upload_file")
    try {
        fileRef.upload(request);
    } catch (error:Error) {
        trace("Unable to upload file.");
    }
}
private function completeHandler(event:Event):void {
 fileRef.removeEventListener(Event.SELECT, selectHandler);
 fileRef.removeEventListener(Event.COMPLETE, completeHandler);
 trace("uploaded");
} 
  

Here is the Ruby:
    def upload_file
      file_data = params[:Filedata]
      file_name = params[:Filename].to_s
      File.open(file_name, "wb") { |f| f.write(file_data.read) })
      render(:xml => "< success />" )
    end

That’s it.  Note, that if your running on a non-windows box you should change “wb” to “w”.