I want show related table columns (customers.name) in all select of model (User) laravel. I use accessor laravel.

user table:

id    name    customer_id
1     hassan  1

customer table:

id    name
1     customer1

now use

$user = Auth::user();
return $user;

I want show:

id: 1,
name: "hassan",
customer_id: {
    id: 1,
    name: "customer1"
}

but show this error:

Failed calling App\User::jsonSerialize()

my User Model.

class User extends Authenticatable
{
	use EntrustUserTrait;
	
	/**
	 * Get the user's customer name.
	 *
	 * @param  string $value
	 * @return array
	 */
	public function getCustomerIdAttribute($value)
	{
		return [
			'id' => $value,
			'name' => $this->customer->name
		];
	}
	
	/**
	 * The attributes that should be casted to native types.
	 *
	 * @var array
	 */
	protected $casts = [
		'customer_id' => 'array',
	];
	
	/**
	 * Get the customer record associated with the user.
	 */
	public function customer()
	{
		return $this->belongsTo(Customer::class);
	}
}

I do not want use below code, I want only change in model.

$user = Auth::user();
$user->customer;