Silverstripe admin: “Has one” dropdown converts to ordinary input field after import

Question

I am having some problems with the admin of Silverstripe. I defined a database model (see class definitions below), and after I do a dev/build everything is looking as expec

Answer 1

You probably shouldn't only rely on the admin scaffolding, and use getCMSFields on your DataObjects to customize what happen in the CMS. In you case, a simple replace of the Troupe dropdown could work, adding this to your Package class:

function getCMSFields()
{
    $fields = parent::getCMSFields();

    $troupeList = Troupe::get()->map()->toArray();
    $troupeSelect = DropdownField::create('TroupeID', 'Troupe')->setSource($troupeList);

    $fields->replaceField('TroupeID', $troupeSelect);

    return $fields;
}

This is quite minimalist and a lot more could me customised.