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Data Model Questions

ManyManyComplexTableField produced field list is ambiguous error




2 June 2010 at 9:17pm Community Member, 63 Posts

Hi folks,

I have got a wierd issue with a many_many relation. I have 2 Pages a ProjectHolder and a ServicePage. The ProjectHolder page has many_many relation the ServicePage. When I add the field to the CMSFields it will come up with a nice annoying error.

...... CASE WHEN "SiteTree"."ClassName" IS NOT NULL THEN "SiteTree"."ClassName" ELSE 'SiteTree' END ORDER BY "Sort" LIMIT 10 OFFSET 0 Column 'ProjectHolderID' in field list is ambiguous

here is my Projectholder

class ProjectHolder extends Page {
   public static $many_many = array(
   function getCMSFields() {
      $fields = parent::getCMSFields();
      $tablefield = new ManyManyComplexTableField(
   return $fields;

and here is my ServicePage

class ServicePage extends Page {
   static $belongs_many_many = array(
'ProjectHolders' => 'ProjectHolder'

Does anyone have an idea as to what the issue could be ? Thx