How to download a dynamically generated file

I need to provide users a link to download an user_guide.txt file.

Currently the user_guide.html.erb looks like this.

Dear <%[email protected] %>,

Please visit <%[email protected]_webiste %> site.


the point is that the file has some variables which needs to be
replaced then user should be able to download these files and use
them.

I can find ways to download a static file but in this case how should
I code such that users are able to download the customized files.

Thanks

Use render_to_string(options = nil, &block) and use the send_data
API.

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