How to create Resources (documents) from the front end (with a form)?

[[FormIt? &hooks=`Formit2Resource` &preHooks=`Resource2Formit` &Resource2FormitFields=`parent,pagetitle,content` &resId=`[[~[[*id]]]]`]]

<h2>[[~[[*id]]]]</h2>
<p>[[+fi.error.error_message]]</p>
<form class="form" action="[[~[[*id]]]]" method="post">
    <input name="nospam:blank" type="hidden" />
    <input name="resource_id" type="hidden" value="[[+fi.id]]" />
    <label for="parent">
        Parent:
        <span class="error">[[+fi.error.parent]]</span>
    </label>
    <input id="parent" name="parent:required" type="text" value="[[+fi.parent]]" />	
	<br/>
    <label for="pagetitle">
        Pagetitle:
        <span class="error">[[+fi.error.pagetitle]]</span>
    </label>
    <input id="pagetitle" name="pagetitle:required" type="text" value="[[+fi.pagetitle]]" />
    <br/>
	<label for="content">
        Content:
        <span class="error">[[+fi.error.content]]</span>
    </label>
    <textarea id="content" cols="55" rows="7" name="content:required:stripTags">[[+fi.content]]</textarea>
<br class="clear" />
<div class="form-buttons">
        <input type="submit" value="Create Resource" />
    </div>
</form>

<?php
$doc = $modx->getObject('modResource',array('id'=>$hook->getValue('resource_id')));

if (empty($doc)){
    $doc = $modx->newObject('modResource');
    $doc->set('createdby', $modx->user->get('id'));
}
else{
    $doc->set('editedby', $modx->user->get('id'));
}

$allFormFields = $hook->getValues(); 
foreach ($allFormFields as $field=>$value)
{

   if ($field !== 'spam' && $field !== 'resource_id'){
         $doc->set($field, $value);
    }
}


$doc->set('template', '1');
$doc->save();

foreach ($allFormFields as $field=>$value)
{
    if ($tv = $modx->getObject('modTemplateVar', array ('name'=>$field)))
    {
        /* handles checkboxes & multiple selects elements */
        if (is_array($value)) {
            $featureInsert = array();
            while (list($featureValue, $featureItem) = each($value)) {
                $featureInsert[count($featureInsert)] = $featureItem;
            }
            $value = implode('||',$featureInsert);
        }	
        $tv->setValue($doc->get('id'), $value);
        $tv->save();
    }
}

return true;

<?php
if (isset($_GET['resId'])){
    if ($doc=$modx->getObject('modResource',array('id'=>$_GET['resId']))){
        $docarray=$doc->toArray();
        $fields = explode(',',$scriptProperties['Resource2FormitFields']);
        $fields[] = 'id';

        foreach ($fields as $field){
       
            if ($doc->getFieldName($field) === null) {
                /* if field isnt defined, look for TV value */
                $tvValue = $doc->getTVValue($field);
                if ($tvValue !== null) {
                    $hook->setValue($field,$tvValue);
                }
            } else {
                /* otherwise get field value */
                $hook->setValue($field,$docarray[$field]);
            }    
        }
    }

    $errorMsg = '<pre>'.print_r($docarray,true).'</pre>';  
    $hook->addError('error_message',$errorMsg);  
}
return true;