title: How to add a default class to text_field in rails 3
body: <p>How to change default generated code for rails form helpers?</p>
  
  <p>Code...</p>
  
  <pre><code>&lt;%= f.text_field :title, class: 'inputbox' %&gt;
  </code></pre>
  
  <p>...generates...</p>
  
  <pre><code>&lt;input id="post_title" name="post[title]" class="inputbox" type="text"&gt;
  </code></pre>
  
  <p>...but I would like that text_field without class argument generated code above by default.</p>
  
  <p>I am using rails 3.2.</p>