Howdy

I have added the following code to create a selectable drop down tree of CMS pages for one of my page types:

class ArchivePage extends Page {

	static $db = array(
			
	);

	static $has_one = array(
		'ArchivePageID' => 'SiteTree',
	);

	function getCMSFields(){
		$tree = new TreeDropdownField('ArchivePageID', 'Choose a Parent page to display an archive of the Child pages', 'SiteTree');
		$fields = parent::getCMSFields();
		$fields->addFieldToTab('Root.Content.Main', $tree, 'Content');
		
		return $fields;
	}

}

This displays a dropdown selection of all of the pages in the website but when I select a page and click "Save" the box resets to just reading "(Choose)".

I'm sure I'm just making a simple mistake but I've been wading through the documentation and forums and haven't found anything that works.

Hopefully someone can let me know what I'm missing.

Cheers
Tama

Update: I changed "ArchivePageID" to "ArchiveParent" to prevent any conflicts and it's still not working.

OK, sorted it out - thanks Mateusz.

You have to remove ID from $has_one:

   static $has_one = array( 
      'ArchivePage' => 'SiteTree', 
   );

But still include it in the getCMSFields:

   function getCMSFields(){ 
      $tree = new TreeDropdownField('ArchivePageID', 'Choose a Parent page to display an archive of the Child pages', 'SiteTree'); 
      $fields = parent::getCMSFields(); 
      $fields->addFieldToTab('Root.Content.Main', $tree, 'Content'); 
       
      return $fields; 
   }