Modifying values with rep.resource.values

[joseph_anderson]

Hello,

I’m trying to append some additional text to a value via a module, and am wondering if this is possible with rep.resource.values. I understand how to do this using rep.value.html, but the problem is that it only needs to be done for one property per item, so I don’t want to cycle through every and each value because it also involves querying the database. So I’d rather just query the database once, so I think I can do that easier using rep.resource.values

But whenever I try to modify the ‘values’ param and then re-set it, it breaks. I see from the Hide Properties module how you could remove entire values, but I want to just modify the value of the value. So I’ve tried something like this…

$values = $event->getParam('values');
$values["dcterms:creator"]["values"][0] = json_decode(json_encode($values["dcterms:creator"]["values"][0]));
$values["dcterms:creator"]["values"][0]["o:label"] = $values["dcterms:creator"]["values"][0]["o:label"] . " (Appended text)";
$event->setParam('values', $values);

I’ve been able to get something like this to work when using rep.resource.json, but doesn’t seem to work here the same.

Best,

Joseph Anderson

[jimsafley]

You’re reassigning a Omeka\Api\Representation\ValueRepresentation object as a JSON object. That’s why it’s breaking. Any subsequent code is expecting a value representation, not JSON. I’m pretty sure that you can’t use the rep.resource.values event to append text, since the representation interface doesn’t allow it. Instead, try the rep.value.html event.

[jimsafley]

I’m not sure your exact specifications but something like this may work, or at the very least put you on the right track:

$sharedEventManager->attach(
    'Omeka\Api\Representation\ValueRepresentation',
    'rep.value.html',
    function (ZendEvent $event) {
        $value = $event->getTarget();
        if ('uri' !== $value->type() || 'dcterms:creator' !== $value->property()->term()) {
            return;
        }
        $uri = $value->uri();
        $uriLabel = $value->value() . ' (Appended text)';
        if (!$uriLabel) {
            $uriLabel = $uri;
        }
        $view = $this->getServiceLocator()->get('ViewRenderer');
        $event->setParam('html', $view->hyperlink($uriLabel, $uri, ['class' => 'uri-value-link', 'target' => '_blank']));
    }
);

[joseph_anderson]

Thanks so much Jim. I’ll play around with rep.value.html then. The reason why I was trying the previous method with the json step was because, and I’m not sure where exactly, I saw in another module something like that with rep.resource.json. So when I want to append text to a value in the json-ld, I can do something like this:

$jsonLd = $event->getParam('jsonLd');
$jsonLd["dcterms:creator"][0] = json_decode(json_encode($jsonLd["dcterms:creator"][0]), true);
$jsonLd["dcterms:creator"][0]["@value"] = $jsonLd["dcterms:creator"][0]["@value"] . " (Appended text)";
$event->setParam('jsonLd', $jsonLd);

I guess what’s happening here is because you’re dealing with ValueRepresentation, to directly modify it you need to convert it to json and then back to an array. In this case, I guess the subsequent code is alright if it it doesn’t remain the ValueRepresentation, whereas in the case of rep.resource.values it needs to be stay as a ValueRepresentation.

I will try rep.value.html instead. Not sure if you remember my question from a long while ago, but this is related to my quest to add relator terms for contributors, which I just picked up working on again

Thanks for your help as always!