title: ActiveAdmin: how to have a text field instead a color picker to input a color?
body: <p>Picture a rails app with a <code>Flower</code> model. The <code>flowers</code> table has a <code>color</code> column. This app uses ActiveAdmin. In the admin layer, I register the the <code>Flower</code> model.</p>
  
  <p><code>app/admin/flower.rb</code></p>
  
  <pre><code>ActiveAdmin.register Flower do
    permit_params :color
  end
  </code></pre>
  
  <p>If I edit an existing flower (or create a new one), ActiveAdmin will force me to edit the color with a color picker. I want to edit the color with a text field.</p>
  
  <p>How should I go about it ?</p>
  
  <p>I use Rails 4.1.4 and ActiveAdmin 1.1.0</p>