Listing 2. views/meetings/new.html.erb, Modified from the Default
Scaffold to Allow the User to Enter One or More People

<h1>New meeting</h1>

<% form_for(@meeting) do |f| %>
 <%= f.error_messages %>

 <p>
  <%= f.label :starting_at %><br />
  <%= f.datetime_select :starting_at %>
 </p>
 <p>
  <%= f.label :ending_at %><br />
  <%= f.datetime_select :ending_at %>
 </p>
 <p>
  <%= f.label :location %><br />
  <%= f.text_area :location %>
 </p>

 <p>With:
   <%= select("person",
              "person_id",
              Person.all.collect { |p| [p.fullname, p.id] },
              {},
              {:multiple => true}) %>
 </p>
 <p>
  <%= f.submit 'Create' %>
 </p>

<% end %>

<%= link_to 'Back', meetings_path %>