Well, since yesterdaty, I’ve managed to make something happen. I don’t think it’s particularly clean, but here it is.
In my plugin.rb file:
# This attempts to override the Notification Emails by sliding in
# our custom template directory first.
require_dependency 'user_notifications'
module ::UserNotificationsOverride
def send_notification_email(opts)
Rails.configuration.paths["app/views"].unshift(File.expand_path("../templates", __FILE__))
super(opts)
end
end
class ::UserNotifications
prepend ::UserNotificationsOverride
end
…and then adjacent to the plugin file is a template/ directory that contains customised .erb files using the same structure as below /app/views. So my plugin now looks like:
/my-email-plugin
├── plugin.rb
└── templates
└── email
├── _post.html.erb
├── invite.html.erb
├── notification.html.erb
└── template.html.erb
What I wanted to do was shift my custom templates folder ahead of the default, in an attempt to replicate what the ::ActionMailer::Base.prepend_view_path line was doing, but without breaking anything else or by carbon-copying the entire send_notification_email method for the sake of changing one line.
If you can think of any ways to improve this, then please do share. 