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Asked: 2026-05-27T14:35:49+00:00

I’m following the instructions here: http://net.tutsplus.com/tutorials/ruby/create-beautiful-administration-interfaces-with-active-admin/ So in Step 2, I go to /app/models/admin_user.rb

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I’m following the instructions here: http://net.tutsplus.com/tutorials/ruby/create-beautiful-administration-interfaces-with-active-admin/

So in Step 2, I go to /app/models/admin_user.rb and append the following:
after_create { |admin| admin.send_reset_password_instructions }

def password_required?
  new_record? ? false : super
end

So then I go to /admin/admin_users/new and I get the following error when I try to add a user

RuntimeError in Admin::AdminUsersController#create<br />
Could not find a valid mapping for #<AdminUser id:2, email:

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1 Answer

  1. Editorial Team

    In your environments/development.rb ensure your classes are cached:

    config.cache_classes = true

    This is not ideal, but necessary in this instance due to a code reloading quirk in Rails, according to comments associated with the bug logged over at GitHub: https://github.com/gregbell/active_admin/issues/733

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