title: rails radio button tag
body: <p>I need a help. i have form tag button in array quiz option. I need to checked true answer when value answer is 1. </p>
  
  <pre><code>&lt;%= radio_button_tag('quiz_en_option[is_answer][]',"1",quiz_option_en.is_answer) %&gt;True 
  &lt;!-- &lt;input id="quiz_en_option_is_answer__1" type="radio" value="1" name="quiz_en_option[is_answer][]" checked="checked"&gt; --&gt;
  </code></pre>
  
  <p>help me please</p>