Question

I’m trying to make a multi select list box in Rails. My view code is:

<div>
  <%=nested_form_for(@allocation) do|builder|%>
    <%=builder.label :song_id, "Pick a song" %>

    <%=builder.select :song_id, options_for_select(
    Song.all.collect {|s| [ [s.title, s.artist].join(" by "), s.id ] }, 
    { include_blank: true, multiple: true, size: 5 }) %>

    <%=builder.submit "Add Song", class: "btn btn-large btn-primary" %>
  <% end %>
</div>

At the moment I just have the normal single selectbox but I want to convert this to a multiselect. Any pointers would be much appreciated. Thanks in advance

Answer 1

This seems to have worked in my case:

<%= builder.select(
    :song_id,
    options_for_select(@selections),
    {},
    {multiple: true, size: 10})
%>