Add hasAttribute() to Eloquent/Model

[johannesschobel]

This PR adds the hasAttribute() method to Eloquent/Model in order to check, if a given attribute exist in this model

[taylorotwell]

I would just suggest using isset($model->key).

[decadence]

@taylorotwell it returns false if attribute exists but has null value.

[johannesschobel]

Actually, i think, isset($field) would have a different behavior.. Additionally, i think, it would be more laravelish to allow it to directly check it at the model itself by calling $model->hasAttribute(...)

[johannesschobel]

@taylorotwell can you please re-open this PR and rethink it?

[johannesschobel]

see this example here:

// let $user be a User model
$user->name = null;
dd(isset($user->name)); // false, even it is set!
dd($user->hasAttribute('name')); // true, even it is null

So i think, the isset(...) approach is not valid here..

[decadence]

@johannesschobel Yes. That's what I write about. I think you should make another PR with this description because Taylor doesn't look on closed PRs.

[denis-chmel]

Need the same, and totally agree with @johannesschobel

// let $user be a User model
$user->name = null;
dd(isset($user->name)); // false, even it is set!
dd($user->hasAttribute('name')); // true, even it is null

I left a petition on change.org for @taylorotwell to merge this.

[royduin]

It's added in Laravel 11.3: #50909

[donnysim]

@royduin it's still wrong because it will return true just because you have a cast or a mutator, which will never indicate that the attribute actually exists.