title: Rails; is_hoge column
body: <p>In Ruby/RoR, we often use <code>active?</code> method to validate things.
  In DB, I use <code>is_</code> prefix for Boolean type.</p>
  
  <p>So I just use <code>is_active</code> and get the result.</p>
  
  <p>But I just  wonder I should wrap <code>is_active</code> with <code>active?</code> method in RoR.
  What do you think about it?</p>