title: How to display only the value in edit page in Active Admin
body: <p>I have a edit form in Active Admin. I need some field as read only. </p>
  
  <p>My current edit page is like</p>
  
  <p><img src="https://i.stack.imgur.com/u3f6z.png" alt="enter image description here"></p>
  
  <p>I need the page look like this</p>
  
  <p><img src="https://i.stack.imgur.com/XFAXS.png" alt="enter image description here"></p>
  
  <p>How can this be done. My code for the edit form page is like</p>
  
  <pre><code>    form :html =&gt; { :enctype =&gt; "multipart/form-data" } do |f|  
        f.inputs "Users" do
          f.input :device, :label =&gt; 'Device', :as =&gt; :select, :collection =&gt; DEVICE, :include_blank =&gt; false
          f.input :current_address, :label =&gt; 'Current Address', :as =&gt; :string
        end
      end
  </code></pre>
  
  <p>Please help.</p>