How to write custom download controller in web2py?

Suppose we have employee table with resume as uplaod field. And we want to download file on the basis of employee id.
Download  url is like app_name/custom_download/employee_id
or <a href="{{=URL('default', 'custom_download', args = employee_id)}}" download>

example: www.example.com/default/custom_download/1

Consider following employee schema:

Then custom download controller will be:

If you have any queries related to this code, please comment below.

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