How to generate a pdf without pushing a button

I want to generate a pdf with pdf-writer. All the pdfs I have generated
in past were like:

format.pdf do
send_data IncidenceDrawer.draw(@incidence, @logs, @relincs),
:filename => ‘incidences/@incidence.id.pdf’, :type => ‘application/pdf’,
:disposition => ‘inline’
end

So, in that view, I had the link
<%= link_to _(‘PDF Format’), formatted_incidence_path(@incidence, :pdf)
%>

Only once I have pushed the link I generated the pdf. I want to generate
it without pushing that button. I think I need some background magic, so
I’m using BackgroundFu, but I can’t use the same code anymore, because
it needs the button to be pushed.

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