title: MailChimp API 1.3 + Hominid 3 + Groupings
body: <p>For some reason I just can't get the latest version of Hominid working with groupings in MailChimp.</p>
  
  <p>Here's a snippet of what I'm doing:</p>
  
  <pre><code>info[:GROUPINGS] = { 'name' =&gt; 'Locations', 'groups' =&gt; 'SomeLocation' }    
  mailchimp = Hominid::API.new(MAILCHIMP_API_KEY)
  list_id = mailchimp.find_list_id_by_name MAILCHIMP_LIST_NAME
  mailchimp.list_update_member(list_id, email_value, info)
  </code></pre>
  
  <p>I've tried seemingly every combination of arrays and hashes to get the groupings working, but I keep getting variations of this error:</p>
  
  <pre><code>&lt;270&gt; "V" is not a valid Interest Grouping id for the list: Test List
  </code></pre>
  
  <p>Any help would be appreciated!</p>