berrypod/lib/berrypod_web/controllers/newsletter_export_controller.ex

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defmodule BerrypodWeb.NewsletterExportController do
use BerrypodWeb, :controller
alias Berrypod.Newsletter
def export(conn, _params) do
csv = Newsletter.export_all_subscribers_csv()
today = Date.to_iso8601(Date.utc_today())
filename = "newsletter-subscribers-#{today}.csv"
conn
|> put_resp_content_type("text/csv")
|> put_resp_header("content-disposition", ~s(attachment; filename="#{filename}"))
|> send_resp(200, csv)
end
end