Save DataObject relation when fields are added via getCMSFields()?

Question

With this code the DataObject ID (InternalExternalLinkID) is not saved to the page when the CMS page is published, how to I automatically add the scaffolding from the dataobject and have the relationship saved (without manually doing onAfterWrite() as described at http://www.silverstripe.org/data-model-questions/show/11044):

class Page extends SiteTree {

    private static $has_one = array(
        'InternalExternalLink' => 'InternalExternalLink'
    );

    function getCMSFields() {
        $fields = parent::getCMSFields();
        $fields->addFieldsToTab('Root.Main', singleton('InternalExternalLink')->getCMSFields());

I understand you probably need to create the dataobject first, get the ID and then save to the Page object - can the CMS not do this scaffolding, create (or update) and save this related dataobject automatically like ModelAdmin does?

Are you trying to show and save all the fields of internalExternalLink in the page edit screen? — jberculo
yes, save the fields from the elated dataobject into the related dataobject — DaveO

wilr wilr · Accepted Answer · 2014-08-10T06:00:50

You should use a GridField for this which handles saving to the nested object. Checkout the relational handler module for a has_one relationship editor. You can also get it working without the module if you don't want to install another dependancy. Just create a new GridField instance and pass your has_one record as an DataList query.

http://addons.silverstripe.org/add-ons/simonwelsh/gridfieldrelationhandler

Save DataObject relation when fields are added via getCMSFields()?

1 Answers