Radio buttons on Rails

Question

Similar to this question: Checkboxes on Rails

What's the correct way of making radio buttons that are related to a certain question in Ruby on Rails? At the moment I have:

<div class="form_row">
    <label for="theme">Theme:</label>
    <br><%= radio_button_tag 'theme', 'plain', true %> Plain
    <br><%= radio_button_tag 'theme', 'desert' %> Desert
    <br><%= radio_button_tag 'theme', 'green' %> Green
    <br><%= radio_button_tag 'theme', 'corporate' %> Corporate
    <br><%= radio_button_tag 'theme', 'funky' %> Funky
</div>

I also want to be able to automatically check the previously selected items (if this form was re-loaded). How would I load the params into the default value of these?

Answer 1

As in this previous post, with a slight twist:

<div class="form_row">
    <label for="theme">Theme:</label>
    <% [ 'plain', 'desert', 'green', 'corporate', 'funky' ].each do |theme| %>
      <br><%= radio_button_tag 'theme', theme, @theme == theme %>
      <%= theme.humanize %>
    <% end %>
</div>

Where

@theme = params[:theme]