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action_mailer.default_url_options not defined in staging?

Julien •
When deployed on Heroku with RAILS_ENV=staging, the "Forgot password" page (/users/password/new) returns an error 500:

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

from app/views/devise/mailer/reset_password_instructions.html.erb at line 5:

<p><%= link_to t('.action'), edit_password_url(@resource, reset_password_token: @token) %></p>

---

This works fine in development and in production however, so it seems closely related to the staging environment.

For development:
action_mailer.default_url_options[:host] is set in config/environments/development.rb:

config.action_mailer.default_url_options = {host: "lvh.me", port: ENV.fetch("PORT", 3000).to_i}

For production:
config/initializers/mail.rb seems to set default_url_options[:host] as well:

if Rails.env.production?
  ActionMailer::Base.default_url_options[:host] = Jumpstart.config.domain

For staging:
Should I manually edit config/environments/staging.rb to add this?
config.action_mailer.default_url_options = {host: "lvh.me", port: ENV.fetch("PORT", 3000).to_i}

Or should I edit config/initializers/mail.rb like this?
if Rails.env.production? || Rails.env.staging?

Thanks!
Chris Oliver •
The mail.rb initializer only configures Production, you can add additional ones there.

We might update the config so you can set each environment separately.
Kips Davenport •
As some of the docs reference setting up a staging env, setting the environment config individually would probably avoid this sort of confusion.
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