I'm trying to duplicate a page including form. Because 3.0.x doesn't have the ability to duplicate, I choosed to use the 3.1.0 beta
3.

It works brilliant, except a part of the duplication in the form.

When set a CustomRule, and duplicate the page, the new page still get's the Rule from the old source. (e.g. "EditableRadioField13" instead of "EditableRadioField26"). Is there a easy solution without a complete rebuild of the function duplicate()?

Ok, i rewrote the function duplicate() in UserDefinedForm.php by myself. It duplicates correctly and takes over the right conditions.

public function duplicate($doWrite = true) {
		$page = parent::duplicate($doWrite);

		// the form fields
		if($this->Fields()) {
			foreach($this->Fields() as $field) {
				$newField = $field->duplicate();
				$newField->ParentID = $page->ID;
        $newField->Name = $newField->ClassName.$newField->ID;
        
        //trek eerst de CustomRules uit elkaar
        $ar = array();
        $ar = unserialize($field->CustomRules); 
        
        if(sizeof($ar) >0){
          $ConditionField = $ar[0]['ConditionField'];
          if($ConditionField != ""){
            //$ar2 = preg_split("/(\d+)/", $ConditionField, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
            
            //selecteer sorteervolgorde, classname uit editableformfield waar naam = $ConditionField
            $child = DataObject::get('EditableFormField')->where('Name = \''.$ConditionField.'\'')->first();
            $sort = $child->Sort;
            $classname = $child->ClassName;
            
            //selecteer id, waar sorteervolgorde en nieuwe parent id
            $new = DataObject::get('EditableFormField')->where('Sort = '.$sort.' AND ParentID = '.$newField->ParentID)->first();
            
            $ar[0]['ConditionField'] = $new->Name;
            $ar = serialize($ar);
            $newField->CustomRules = $ar;
          }
        }
        
				$newField->write(); 
        $newField->doPublish('Stage', 'Live', true);
			}
		}
    $page->doPublish('Stage', 'Live');
    
    // the emails
		if($this->EmailRecipients()) {
			foreach($this->EmailRecipients() as $email) {
				$newEmail = $email->duplicate();
				$newEmail->FormID = $page->ID;
				$newEmail->write();
			}
		}
    
		return $page;
	}

See also GitHub issue #19: https://github.com/silverstripe/silverstripe-userforms/issues/19

I've also tried to fix this and done a pull request: https://github.com/fvue/silverstripe-userforms/commit/2b8a958fcf317bf8d470d04f5df3bcf0c5f5cc94