[11.x] Support soft deleted models when using explicit route model binding

[gbradley]

This PR allows the resolution of soft-deleted models when using Laravel's explicit route-model binding feature.

It allows developers to use explicit route-model binding without having to customise the resolution logic when dealing with soft-deleted models. To do so it uses the same withTrashed() method as implicit binding.

Before:

Route::get('/users/{user}', ...);

Route::bind('user', function (string $value) {
    return User::where('id', $value)->withTrashed()->firstOrFail();
});

After:

Route::get('/users/{user}', ...)->withTrashed();

Route::model('user', User::class);

This introduces no breaking changes, as resolveSoftDeletableRouteBinding is only being called when the route explicitly requests withTrashed() and the corresponding model uses the SoftDeletes trait.

[Rizky92]

I think we already have it...
https://laravel-code.tips/you-can-call-withtrashed-on-a-route-to-accept-soft-deleted-models/

What's the difference with this method?

[gbradley]

@Rizky92 That example is using implicit binding. Currently, withTrashed doesn’t work with explicit binding; this PR makes the behaviour consistent.