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• piksel
  
  Community Member
  12 posts
  2 SilverStripe Sites

  Error: 'ParentID' appears twice

  16 May 2008 at 11:31am

  Hi,

  I'm trying to create a new dataobject called Category. You can have categories and sub-categories so I'm trying to code it so that a Category object can have another Category object as it's parent (has_one) or it can have multiple "Category" objects (has_many).

  I thought this would be quite simple but I can't work out how to get around this error (see title of post). This is what I have so far:

  
  class Category extends DataObject {
     static $db = array(
        'Name' => 'Text',      
        "Type" => "Enum('Business, Event, Community', 'Business')"      
  );
     static $default_sort = "Name";

  static $has_one = array(   
  'Parent' => 'Category'
  );
     static $has_many = array(
        'Children' => 'Category'
     );

     function getCMSFields_forPopup() {
        $fields = new FieldSet();
        $fields->push( new TextField( 'Name' ) );      
        $fields->push( new DropdownField("ParentID", "Parent Category", array()));      
        $fields->push( new DropdownField("Type", "Type",
           array(
              'Business' => 'Business',
              'Event' => 'Event',
              'Community' => 'Community'
           )
        ));      
        return $fields;
     }
  }
  

  I can see that it's not happy with the field I'm trying to create where you select the parent Category (or leave empty if it's a top-level category). How do I do this?? Are there any examples I can look at in one of the modules? I looked at the Post object in the Forum module but it's slightly different.

  Thanks.

  Last edited: 16 May 2008 at 12:03pm