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  • Howard
    Community Member
    215 Posts

    ModelAdmin user error Link to this post

    Hi guys,

    I am looking into how to use modeladmin now that there is some documentation to it.

    I have done a clean install from the 2.3 branch then created 3 files in mysite/code:


    class ProductsHolder extends Page {
    static $allowed_children = array( 'Product' );

    class ProductsHolder_Controller extends Page_Controller {



    class Product extends DataObject {

    static $db = array(
    'Name' => 'Varchar',
    'ProductCode' => 'Varchar',
    'Description' => 'Text'

    static $has_one = array(
    'Category' => 'Category'

    static $searchable_fields = array(



    and MyCatalogAdmin.php


    class MyCatalogAdmin extends ModelAdmin {

    protected static $managed_models = array(

    static $url_segment = 'products'; // will be linked as /admin/products
    static $menu_title = 'My Product Admin';



    After db build I log into the admin and am able to select "My Product Admin" which then appears to load fine until I click on "Create 'Product'" it shows an error message:

    Error: "Bad class to singleton() - Category" at line 263 of /Users/Howard/Desktop/localhost/jdmnz/sapphire/core/Core.php

    the line from core.php in question reads:

    if(!class_exists($className)) user_error("Bad class to singleton() - $className", E_USER_ERROR);

    Any help would be greatly appreciated!

  • jam13
    121 Posts

    Re: ModelAdmin user error Link to this post

    Think your problem might be here:

    static $allowed_children = array( 'Product' );

    Product is not derived from SiteTree, so I don't think this will work.

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