Model binding for JSON api using Laravel - laravel

Question

We are moving an older PHP project over to laravel. We are trying to post JSON to our api we created, but are not aware how to have the JSON be bound to a model. We added the model as a parameter to the function, it is created but none of the properties are set on it from the JSON. Does this type of model binding exist in laravel?
class CalculatorModel
{
/**
* Value A.
*
* #var integer
*/
public $A;
/**
* Value B.
*
* #var integer
*/
public $B;
}
class CalculatorController
{
// What is trying to be achieved.
public function add(CalculatorModel $model)
{
return Calculator::Add($model);
}
// What we are trying to avoid
// as there is a lot of properties/objects in our real world JSON
public function add(Request $request)
{
$a = $request->json()->all();
$m = new CalculatorModel();
$m->A = $a['A'];
$m->B = $a['B'];
....
return Calculator::Add($m);
}
}
// in reoutes/api.php
Route::post('add', 'API\CalculatorController#add');
// External library's class
class Calculator
{
public static function Add(CalculatorModel $m)
{
return $m->A + $m->B;
}
}
Simple JSON post
{
"A": 2,
"B": 2
}
In ASP.Net, we are able to add a [FromBody] attribute to the parameter so that ASP.Net would bind the content body as the model instead of form content. We are looking for similar functionality in laravel.

Answer 1

There is no such binding in Laravel. Laravel binding is about Models/DB access as #PKeidel said. All you need is controller method without any models.
public function add(Request $request)
{
return $request->A + $request->B;
}
UPD: What about new constructor for CalculatorModel class?
public function __construct(array $properties = [])
{
foreach ($properties as $key => $value) {
$this->{$key} = $value;
}
}
public function add(Request $request)
{
$m = new CalculatorModel($request->all());
return Calculator::Add($m);
}
In any case Laravel does not offer out of the box solution for this.

Answer 2

Try this to wrap your API, which can then be used by Eloquent as if it were a database model:
https://github.com/CristalTeam/php-api-wrapper

Answer 3

All what models are about is saving/reading something from the database. So if this is not what you want, forget about it. Because in Laravel models are bound to database tables ;-)
If you just want so receive some values as json, do a calculation and return a value you are thinking to complicated.
Create a route:
Route::post('add', function() {
$data = request()->json();
return $data->get('A') + $data->get('B');
});
Or:
Route::post('add', function(\Illuminate\Http\Request $r) {
return $r->A + $r->B;
});
This is all it takes.
After that just make sure to send your data with json header. Like so:
fetch('/add', {
method:"post",
headers: {'Content-Type': 'application/json'},
body: '{"A": 2,"B": 2}'
})
.then((d) => d.text())
.then((html) => {
output.innerHTML = html;
})
See it in action here: https://laravelplayground.com/#/snippets/006b4871-5d92-4a2d-b8af-8a21423024e6