title: How to iterate over an array in rails activeadmin CSV?
body: <p>I was trying to create a custom CSV in active admin for Saloon model and I have one column with an array of OperationalHours.</p>
  
  <p>Here is my Object:</p>
  
  <pre><code>[20] pry(main)&gt; Saloon.first
  =&gt; #&lt;Saloon:0x00007fa773496cf0
   id: 1,
   address_1: "1313 2nd St South",
   city: "Battlefield",
   state: "Missouri",
   zip: "63303",
   operational_hours:
    [#&lt;OperationalHours:0x00007fa77aa72848 @closing_time="5:00 PM", @notes="", @opening_time="9:00 AM"&gt;,
     #&lt;OperationalHours:0x00007fa77aa725f0 @closing_time="5:00 PM", @notes="", @opening_time="9:00 AM"&gt;,
     #&lt;OperationalHours:0x00007fa77aa723c0 @closing_time="5:00 PM", @notes="", @opening_time="9:00 AM"&gt;,
     #&lt;OperationalHours:0x00007fa77aa72190 @closing_time="Closed", @notes="", @opening_time="Closed"&gt;,
     #&lt;OperationalHours:0x00007fa77aa71f10 @closing_time="Closed", @notes="", @opening_time="Closed"&gt;,
     #&lt;OperationalHours:0x00007fa77aa71ce0 @closing_time="Closed", @notes="", @opening_time="Closed"&gt;,
     #&lt;OperationalHours:0x00007fa77aa71ab0 @closing_time="Closed", @notes="", @opening_time="Closed"&gt;],
   name: "Clear Cut",
   trial_period: 30,
   time_zone: "Central Time (US &amp; Canada)"&gt;
  </code></pre>
  
  <p>And in my active admin file I have:</p>
  
  <pre><code>ActiveAdmin.register Saloon do
    csv do 
      column :name 
      column "Operation Hours" do |sal|
       sal.operational_hours.each do |hour|
        "#{hour.opening_time}-#{hour.closing_time}"
       end
      end
    end
  end
  </code></pre>
  
  <p>But operational hours on CVS has:</p>
  
  <pre><code>[#&lt;OperationalHours:0x00007fcf295e2a90 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e2798 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e2428 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e2158 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e1eb0 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e1910 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;,
   #&lt;OperationalHours:0x00007fcf295e1690 @opening_time="9:00 AM", @closing_time="5:00 PM", @notes=""&gt;]
  </code></pre>
  
  <p>Is there a way to iterate over operational hours and show each as "9:00 AM-5:00 PM"format?</p>