Issue
i recently start using Model::preventLazyLoading()
but it actually throws an error even when the relation is not loaded but it may be loaded sometimes
like this in resource 'discount' => $this->whenLoaded('meta', $this->meta->discount ?? 0),
laravel version: 9.17.0
Solution
For PHP to resolve your syntax here. It has to load $this->meta no matter what, as it has precedence over the whenLoaded() method, when PHP parsers your code.
$this->whenLoaded('meta', $this->meta->discount ?? 0)
That is why whenLoaded() can take a closure() to avoid loading relationship, unless they are actually loaded. This approach will first evaluate the closure after the whenLoaded() condition is met.
$this->whenLoaded('meta', function () { return $this->meta->discount ?? 0; });
Answered By – mrhn
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