[12.x] Adds AsFluentObject caster

[freebuu]

Hello!

Idea

I would like to suggest the functionality of casting json fields into Fluent type objects. In some cases, as a model property, you want to have not just an array, but a typed object.

Usage

Like AsCollection:

Basic usage

protected $casts = [
  'some_prop' => AsFluentObject::class, //cast to basic Fluent object
];

Cast to custom Fluent object (main behavior)

/**
 * @property string $object_property
 */
class CustomFluent extends Fluent {}

protected $casts = [
  'some_prop' => AsFluentObject::class.':'. CustomFluent::class //cast to CustomFluent object
];

As function

protected function casts(): array
{
  return [
      'some_prop' => AsFluentObject::using(CustomFluent::class) //cast to CustomFluent object
  ];
}

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!