Problem: Missing host to link to! Please provide :host parameter or set default_url_options[:host] when sending emails.

Problem:
Missing host to link to! Please provide :host parameter or set default_url_options[:host] when sending emails.

Solution:
You can pass host parameter to url functions, but it’s cleaner to configure it with a before_filter globally in your application_controller.rb:

  # application_controller.rb
  before_filter :mailer_set_url_options
 
  ...
 
  def mailer_set_url_options
    ActionMailer::Base.default_url_options[:host] = request.host_with_port
  end