add findAttribute method

[jasperwissels]

I find myself writing a lot of

$param = $request->hasAttribute('name') ? $request->getAttribute('name') : null;

Would you consider adding this feature?

[lode]

I'm doubting a bit for adding this, because it looses the difference between unset (PATCH request, not wishing to change a property) and set-but-null (PATCH request, wishing to unset a current value). How do you deal with that? / Would you want to deal with that?

[jasperwissels]

for most PATCH endpoints i wouldnt use this, but for create endpoints it transforms 4 lines into 1.

Not really expecting to add alot of endpoints like this in the near future, so when in doubt, maybe just ignore for now :)

[lode]

Would it maybe be easier to have a getAttributes(): array<string, mixed>?

[jasperwissels]

Multiple endpoints I know would love this

[lode]

Check, I'll add a release for that!

[lode]

Discussed and not going for this for now. I rather build something that converts an incoming document to objects you can handle, alike AttributeObject. But that's a bit more work, I'll add an issue for that.

In the mean time, this can be implemented easily by extending the RequestParser:

class CustomRequestParser extends RequestParser {
	public function getAttributes(): array {
		return parent::getDocument()['data']['attributes'] ?? [];
	}
}