[2.x] Resolve Closure before checking if a prop implements the Arrayable contract

[rodrigopedra]

On my projects, I use spatie/laravel-view-models to organize complex controller responses.

The Spatie\ViewModels\ViewModel implements the Illuminate\Contracts\Support\Arrayable, so when Inertia can handle a ViewModel instance like a set of props.

When a ViewModel instance is converted to an array, all public properties and methods are converted to array keys. If a public method does not expect any parameters, then it is executed and its value is used. On the other hand, if a public method expects one or more parameters, it is converted to a \Closure.

Currently, the Inertia\Response@resolveArrayableProperties() method, checks if a property is a \Closure after checking if it is an object that implements Illuminate\Contracts\Support\Arrayable, which to me makes little sense as the method is named to "resolve arrayable properties".

Use case

I have the following view model:

<?php

use App\Models\Order;
use App\Models\User;
use App\Support\Browser\Browser;
use App\Support\UserPreferences;
use Spatie\ViewModels\ViewModel;

class SettingsViewModel extends ViewModel
{
    public function __construct(
        // this will be exported directly by ViewModel@toArray()
        public readonly Order $order,

        // this will NOT be exported by ViewModel@toArray()
        private readonly User $user,
    ) {}

    // This will be exported as a string by ViewModel@toArray()
    public function user(): string
    {
        return $this->user->email;
    }

    // **********************************************************
    // This will be exported as a \Closure by ViewModel@toArray()
    public function preferences(Browser $browser): UserPreferences
    {
        return new UserPreferences($browser, $this->user);
    }
}

Where App\Support\UserPreferences also implements Illuminate\Contracts\Support\Arrayable.

Currently, when SettingsViewModel@toArray() is called, SettingsViewModel@preferences is converted to a \Closure, and when Inertia\Response@resolveArrayableProperties() is called, the \Closure is executed after checking if the property implements the Arrayable contract.

I end up with a property holding an empty object, as it doesn't get properly processed.

A simpler example would be returning a \Closure that returns a simple Arrayable instance:

return Inertia::render('IndexPage', [
    'foo' => fn () => new class (['name' => 'Foo']) implements Arrayable {
        public function __construct(
            private readonly array $attrs,
        ) {}

        public function toArray()
        {
            return $this->attrs;
        }
    },
]);

The response currently converts the foo property to an empty object, when I, as a user, would expect its toArray() method to be executed:

{
    "component": "IndexPage",
    "props": {
        "errors": {},
        "foo": {}
    },
    "url": "\/home",
    "version": "4847538ced1a39bde916e313e3dda74a",
    "clearHistory": false,
    "encryptHistory": false
}

This PR:

• Moves the check if a property is a \Closure before checking if a property implements Arrayable