How get data having relationships between tables using Laravel - php

Question

I have an API with Laravel, and I have decided to use relations between tables, I have related them using these functions in all migrations:
// Migration file: 2020_05_26_185555_create_customers_table.php on line 27
$table->foreign('user_id')->references('id')->on('users');
And then I've implemented functions like the following:
(which get the records it's related to):
// Model app\User.php on line 80
public function customers()
{
return $this->hasMany(Customer::class);
}
On Customers controller, How can I use the function to show above to list all the clients of that user** , that is, replace the following code:
// Controller Customer\CustomerController.php on line 17
public function index()
{
$user_id = Auth::id();
$customers = Customer::where('user_id', $user_id)->get();
return $this->showAll($customers, 200, $filters);
}
For something like the following (Just an example, it doesn't work, but it's the idea of ​​what I mean):
// Controller Customer\CustomerController.php on line 17
public function index()
{
$customers = User::customers(); // Ejemplo
return $this->showAll($customers, 200, $filters);
}
My goal is to create relationship between relevant table, example, a user's clients** , without using a condition, like my current implementation of code.
Can someone help me with this?

Answer 1

You can use the dynamic property for the relationship to access it (and have it loaded):
public function index()
{
$user = Auth::user();
$customers = $user->customers;
...
}
Laravel 7.x Docs - Eloquent - Relationships - Relationship Methods vs Dynamic Properties