Cakephp 3 “Trying to get property of non-object” error with h() when Null

Question

OK, I have a view template where I want to display an associated value from my 'item' entity:

<?= h($item->itemgroup->groupname)?>

If the $item->itemgroup_id is NULL, I get the error:

Trying to get property of non-object

It also errors without the h() function. However, if I change the view code to:

<?= h($item['itemgroup']['groupname']) ?>

It does not error, and displays a blank as expected.

Is it necessary to update all the baked view template code where a value is potentially NULL? Or is it a matter of database setup (i.e., not using NULL for a field that can be potentially blank)?

Thanks in advance for any insight or advice?

Cheers, D.

Yosi Azwan · Accepted Answer · 2017-10-29 08:35:06Z

1

Is it necessary to update all the baked view template code where a value is potentially NULL? Or is it a matter of database setup (i.e., not using NULL for a field that can be potentially blank)?

Yes, it is.

To avoid error, just use :

<?=$item->itemgroup!==null ? h($item->itemgroup->groupname) : ''?>

answered Oct 29, 2017 at 8:35

Yosi Azwan

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1 Comment

dividedbyzero Over a year ago

Thanks Yosi. Still I'm not sure why <?= h($item['itemgroup']['groupname']) ?> works, while the other way h($item->itemgroup->groupname) fails. I suppose the way you propose is safer.

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