With Active Admin and Devise, we want to: * Skip email confirmations * Require password and email confirmations, but only when changing the email or password

This code supports our requirements:

ActiveAdmin.register User do
  controller do
    def update
      if params[:user][:password].blank?
        params[:user].delete("password")
        params[:user].delete("password_confirmation")
      end
      if params[:user][:email].blank?
        params[:user].delete("email")
        params[:user].delete("email_confirmation")
      end
      super
    end
  end

  before_save do |user|
    user.skip_confirmation!
    user.skip_reconfirmation!
  end
end

See the Active Admin DSL for details