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The main solution described in the Devise wiki doesn’t work for setting arbitrary subdomains and is a problem if you’re triggering generation of email during a request in one subdomain (or the root domain of your application) and want the links in the email to reference a different subdomain. The generally accepted way to make it work is to give the <code>url_for</code> helper a <code>:subdomain</code> option. <pre><code># app/helpers/subdomain_helper.rb module SubdomainHelper def with_subdomain(subdomain) subdomain = (subdomain || "") subdomain += "." unless subdomain.empty? host = Rails.application.config.action_mailer.default_url_options[:host] [subdomain, host].join end def url_for(options = nil) if options.kind_of?(Hash) && options.has_key?(:subdomain) options[:host] = with_subdomain(options.delete(:subdomain)) end super end end </code></pre> The next step is crucial and I suspect it is where a lot of people get tripped up (I know I did). Make sure that Devise mixes your new subdomain helper into its mailer objects by adding the following code to <code>config/application.rb</code> <pre><code> config.to_prepare do Devise::Mailer.class_eval do helper :subdomain end end </code></pre> Now when you do a <code>link_to</code> in your Devise mailer template, you can easily specify a <code>:subdomain</code> option. <pre><code>link_to 'Click here to finish setting up your account on RightBonus', confirmation_url(@resource, :confirmation_token => @resource.confirmation_token, :subdomain => @resource.subdomain) </code></pre>
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