How to request email confirmation in devise?

Question

Ruby on Rails

The fact is that you need to ask the user to confirm the email if he did not confirm it, how to do this?
and display on certain pages the user's confirmed email exactly the confirmed email (for moderators and admins)
something like <

% if confirmation.present? %>
 <% @user.email %>
<% else %>
пользователь не подтвердил емайл
<%  end %>

rails 4
devices (3.2.1)

Answer 1

if @user.confirmed?
  # ...
else
  @user.send_confirmation_instructions 
end

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