[Deprecated] DMZ 1.5.4 (DataMapper OverZealous Edition)

[eluser]OverZealous[/eluser]
[quote author="chadbob" date="1258963948"]
How does the CSV extension handle has many relationships?[/quote]

The CSV extension is very basic. In short, it does not support relationships at all.

But you have the source. Feel free to augment it. Optionally, you could store the IDs of the related objects in a different field, then use that to save the item later.

If you are importing, you can use the callback:
Data:

Code:

id,name,widget_ids
1,"Thing","5,6,7"
2,"Other Thing","5,7,9"

Code:

Code:

// Controller:
function _handle_import($object) {
    $widget_ids = explode(',', $object->widget_ids);
    $widgets = array();
    for($id in $widget_ids) {
        $w = new Widget($id);
        if($widget->exists()) {
            $widgets[] = $w;
        }
    }
    return $object->save($widgets);
}

function import_csv($csv_file) {
    $object = new Object();
    $object->load_extension('csv');
    $count = $object->csv_import($csv_file, NULL, TRUE, array($this, '_handle_import'));
    echo "$count Objects imported."
}

Obviously, you'll want to do more verification, etc., to make sure that no one is hacking, but this is a skeleton of the code.