RFC: Custom variadic UI

[julik]

We are using email previews a lot, and we have many variations in our templates regarding model objects that participate in email rendering. Using the menus for raw/html/text and languages is really cool, and I thought that it would be nice to add some call for adding custom variadic UI to the preview pages. Something like

def notify_person
  add_parameter_selector :recipient_id, {"John" => 1, "Jane" => 2}
  recipient = Recipient.find(@recipient_id)
  DownloadMailer.notify_recipient transfer, recipient
end

with an additional effect that add_parameter_selector would preset the defined instance variable to the first value of the select. Would that be welcome?

[glebm]

Perhaps it would be better to add a view hook to where you would render the UI?
Or you could use the existing nav hook. See https://github.com/glebm/rails_email_preview/blob/master/README.md#hooks

[dmitry]

@julik looks similar: #52