ActionView::Template::Error: Missing host to link to!

[justinwiley]

I'm using Rails 4.1, and getting:

ActionView::Template::Error:
       Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true

...when running on a template that contains asset paths. I was able to solve this by updating production.rb, development.rb etc to set Rails.application.routes.default_url_options:

Rails.application.routes.default_url_options = config.action_mailer.default_url_options = { :host => 'examplecom', :protocol => 'https' }

This seems to work, but since I can imagine this is a common issue, wondering if there's a better way?

[hgani]

I am also looking for a better way to do this. In particular, I need to set the host dynamically but cannot simply modify default_url_options because it's not thread-safe.

May be the gem can implement a solution similar to the one described at http://inopinatus.org/2015/09/08/using-url-helpers-in-rails-activejob-background-jobs/

But the tricky thing is that instead of implementing it in the job/mailer, it needs to be implemented so that this works inside the template/partial.