如何从不同的控制器访问变量以使自定义下载操作起作用

I have a resumes controller and a welcomes controller in my app. The welcomes controller has only an index action which is there for the root page. The purpose of the resumes controller is to upload(new/create), download(download) etc. pdf files as an logged in user and it works great so far. I have a resumes controller and a welcomes cont