Assign TV to template based on TV yes/no?

<?php
$yesNoTvId = 12; // ID of Yes/No TV
$tvId = 14; // id of TV to attach
$templateId = 3; // ID of Template to attach it to


/* get the templateVarTemplate if it exists */
   $tvr = $modx->getObject('modTemplateVarTemplate', array('tmplvarid' => $tvId, 'templateid' => $templateId));

/* check the YesNo TV */
$attach = $resource->getTVValue($yesNoTvId);

if ($attach) { // yes
    

   /* create it if necessary */
   if (!$tvr) {
       $tvr = $modx->newObject('modTemplateVarTemplate');
   }

   /* set its values and save */
   $tvr->set('tmplvarid', $tvId);
   $tvr->set('templateid', $templateId);
   $tvr->save();
} else {  // no
   /* if templateVarTemplate exists and YesNo TV is set to no, remove the connection */
   if ($tvr) {
      $tvr->remove;
   }
}