Populate fields in save hook

[arnoson]

Hello,

I'm trying to do the following: When a user saves a page I want to populate some fields on the same page. For example: calculate the ratio of an image and save it in a hidden field.
I've created a Module and populate the field in a beforeSave hook. But my manually populated field doesn't get saved. I guess I have to call $page->save() in order to save the field, but this would lead to an infinite loop. Because I populate the field in a beforeSave hook shouldn't the page save the field right after the execution of my hook?

 

<?php
class ItemHooks extends WireData implements Module {
	public static function getModuleInfo() {
		return array(
			'title' => 'item hooks',
			'version' => 100,
			'summary' => 'add item hooks to process items after beeing saved',
			'href' => '',
			'singular' => true,
			'autoload' => true
		);
	}

	public function init() {
		$this->pages->addHookBefore('save', $this, 'handleSave');
	} 

	public function handleSave($event) {
		$page = $event->arguments('page');
		$fields = $page->fields;
		$field = $fields->get('hidden_field');
		$field->set('value', 'test');
		$fields->save($field);
	}
}
?>

thanks,
Arno

[elabx]

I think you have to call save on the field object, not the global $fields.

EDIT:

what about:

$page->set("hiden_field", $value);

Because I think you are trying to save the actual field (in the whole PW context), not the field that actually belongs to the page.

This would set the field value so it get's saved after the hook.

[arnoson]

Yes the $page->set() works!
thank you very much