Laravel 5.6 passing eloquent model as parameter to a function - php

Question

I have a selection control on a blade form that is to be refreshed via ajax through this function:
function getOpciones(tbName) {
$.get('/ajax/read-data/' + tbName, function(data){
return (data);
});
}
The function takes a string variable 'tbName' whith the name of the table the control is related to, and passes it on as a parameter to the route:
Route::get('/ajax/read-data/{modelo}', 'AjaxController#readData');
Then the controller should get the parameter {modelo}, and retrieve the records in that table:
use App\RegFiscal;
public function readData($modelo) {
$arreglo = $modelo::all();
return response($arreglo);
}
But even though I am referencing the model with 'use App\RegFiscal', all I get is this error in laravel log:
2018-03-23 18:52:08] local.ERROR: exception
'Symfony\Component\Debug\Exception\FatalErrorException' with message
'Class 'RegFiscal' not found' in
C:\wamp64\www\laravel\cte\app\Http\Controllers\AjaxController.php:32
I´m new to Laravel, so needless to say I am lost and any help would be greatly appreciated. Thanks!

Answer 1

Just because you use App\RegFiscal doesn't mean $modelo is associated with it.
What you can do, though, is use app("App\\$modelo") to load in your model based on the parameter you get from the router. You would no longer need to use App\RegFiscal either.
$arreglo = app("App\\$modelo");
return response($arreglo::all());
This is assuming your model is stored in the default app directory within your Laravel project. If not you can change "App\" to where ever it is stored. If for example your model is in app\models\modelname.php it would be "App\Models\\$modelo".

Answer 2

You can do this as the following:
public function readData($modelo) {
$modelName = '\App' . '\\' . $modelo;
$class = new $modelName();
arreglo = $class::all();
return response($arreglo);
}

Answer 3

To those like me who wanted to inject it on a constructor, here's how to do it:
~$ php artisan make:provider MyProvider
Then override the register function like so:
class MyProvider implements ServiceProvider {
/** #override */
public function register() {
$this->app->bind(ShapeInterface::class, function ($app) {
return new Square($app->make(MyModel::class));
});
}
}
The ShapeInterface is a simple interface and Square is a simple class that implements the shape interface with a constructor parameter of the eloquent model.
class Square implements ShapeInterface {
private MyModel $model;
function __construct(MyModel $model) {
$this->model = $model;
}
...
}