How can I send binary data from Sinatra?

Question

I want to send binary data from a Sinatra application so that the user can download it as a file.

I tried using send_databut it gives me an undefined

Answer 1

I did it like this:

get '/download/:id' do
  project = JSON.parse(Redis.new.hget('active_projects', params[:id]))
  response.headers['content_type'] = "application/octet-stream"
  attachment(project.name+'.tga')
  response.write(project.image)
end