title: How to have a default radio button checked in Ruby?
body: <p>I have a radio button built using Ruby as in below</p>
  <pre><code>      &lt;p&gt;Which design do you prefer to use? &lt;/p&gt;
        &lt;% [ 'Design 1', 'Design 2', 'Design 3', 'Design 4', 'Design 5' ].each do |theme| %&gt;
            &lt;br&gt;&lt;%= radio_button_tag 'theme', theme, @theme == theme %&gt;
            &lt;%= label_tag &quot;theme_#{theme}&quot;, theme.humanize %&gt;
        &lt;% end %&gt;
  </code></pre>
  <p>I want to ensure that the first element (aka Design 1) is always checked by default unless user choses some other design.</p>