_form.html.erb

<%= form_for(@user) do |f| %>
  <% if @user.errors.any? %>
    <div class="error_messages">
      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

      <ul>
      <% @user.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :email %><br />
    <%= f.text_field :email %>
  </div>
  <div class="field">
    <%= f.label :gender %><br />
    <%= f.select :gender, %w[Male Female Unspecified] %>
  </div>
  <div class="field">
    <%= f.check_box :public_profile %>
    <%= f.label :public_profile %>
  </div>
  <div class="field">
    <%= f.label :bio %><br />
    <%= f.text_area :bio %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>