Eliminate one db call in IP subnet utilization report. Limit clause is not applied until after all rows to be returned are calculated so calling has_rows provides no optimization versus calling ->all in controller and checking for results before sending to template. Also use HashRefInflator.

Netdisco/share/views/ajax/report/subnets.tt

@@ -1,6 +1,3 @@
-[% IF NOT results.has_rows %]
-<div class="span2 alert alert-info">No matching records.</div>
-[% ELSE %]
 <table class="table table-bordered table-condensed table-striped nd_floatinghead">
   <thead>
     <tr>
@@ -11,7 +8,7 @@
     </tr>
   </thead>
   </tbody>
-    [% FOREACH row IN results.all %]
+    [% FOREACH row IN results %]
     <tr>
       <td class="nd_center-cell"><a href="[% uri_for('/report/ipinventory') %]?subnet=[% row.subnet | uri %]&daterange=[% daterange | uri %]&limit=[% row.subnet_size | uri %]">
                [% row.subnet | html_entity %]</a></td>
@@ -22,5 +19,3 @@
     [% END %]
   </tbody>
 </table>
-[% END %]
-

Netdisco/share/views/ajax/report/subnets_csv.tt

@@ -1,7 +1,7 @@
 [% USE CSV %]
 [% CSV.dump([ 'Subnet' 'Size' 'Number of Active Nodes' 'Percent Utilization' ]) %]
 
-[% FOREACH row IN results.all %]
+[% FOREACH row IN results %]
   [% mylist = [] %]
   [% mylist.push(row.subnet) %]
   [% mylist.push(row.subnet_size) %]