<% form_for @user, :url => password_reset_path(params[:id]) do |f| %> <% if @user.errors.any? %>

Ошибка:

<% end %>
<%= f.label :password %> <%= f.password_field :password %>
<%= f.label :password_confirmation %> <%= f.password_field :password_confirmation %>
<%= f.submit "Обновить пароль" %>
<% end %>