Show last user activity in admin ordergroups too

app/helpers/admin/ordergroups_helper.rb

@@ -0,0 +1,10 @@
+module Admin::OrdergroupsHelper
+  def ordergroup_members_title(ordergroup)
+    s = ''
+    s += ordergroup.users.map(&:name).join(', ') if ordergroup.users.any?
+    if ordergroup.contact_person.present?
+      s += "\n" + Ordergroup.human_attribute_name(:contact) + ": " + ordergroup.contact_person
+    end
+    s
+  end
+end

app/views/admin/ordergroups/_ordergroups.html.haml

@@ -5,17 +5,18 @@
   %thead
     %tr
       %th= heading_helper Ordergroup, :name
-      %th= heading_helper Ordergroup, :contact
-      %th= heading_helper Ordergroup, :contact_address
       %th= heading_helper Ordergroup, :user_tokens
+      %th= heading_helper Ordergroup, :contact_address
+      %th= heading_helper Ordergroup, :last_user_activity
       %th= t 'ui.actions'
   %tbody
     - for ordergroup in @ordergroups
       %tr{:class => cycle('even','odd', :name => 'groups')}
         %td= link_to ordergroup.name, [:admin, ordergroup]
-        %td= ordergroup.contact
+        %td{title: ordergroup_members_title(ordergroup)}
+          %abbr{title: ordergroup_members_title(ordergroup)}= ordergroup.users.size
         %td= link_to_gmaps ordergroup.contact_address
-        %td= ordergroup.users.size
+        %td= format_date ordergroup.last_user_activity
         %td
           = link_to t('ui.edit'), edit_admin_ordergroup_path(ordergroup), class: 'btn btn-mini'
           = link_to t('ui.delete'), [:admin, ordergroup], :data => {:confirm => t('admin.confirm', name: ordergroup.name)},