Laravel Auth User add custom data - php

Question

We are currently working on an application with a Google Login with Laravel with Socialite. We have a Auth user who gets a permission number ex. 264. We have made a function which returns an array with all binary numbers this permission number is made off.
Because calling this function every single time a page loads may be kinda heavy, we thought of adding this once when the Auth::user() is created. We thought of adding a custom constructor in the Model, but we can't make it work.
function __construct($attributes = array()) {
parent::__construct($attributes);
$this->permissionsArray = PermissionHelper::permissionConverter($this->permissions);
}
But we can't get it to work, $this doesn't have values when calling this function.
TLDR;
Directly after making the Auth user I want to call the permissionConverter function and save the data to the user so we can use it more often. Any suggestions on how to do this?
EDIT: I checked all answers out today, succeeded with one of them, but I assumed Laravel put the authenticated user in the SESSION or something. I found out it doesn't and it gets all the data from the database every request. We couldn't do what we requested for unfortunately. So I just had to refactor the script and make it as efficient as possible (although it became a bit less readable for less experienced programmers).
Thanks for the help :D

Answer 1

Maybe you can use this solution ? https://stackoverflow.com/a/25949698/7065748
Create a on the User Eloquent model a boot method with
class User extends BaseModel {
public static function boot() {
static::creating(function($model) {
$model->permissionsArray = PermissionHelper::permissionConverter($model->permissions);
});
// do the same for update (updating) if necessary
}
}
Can't you just use this method ?
If new user:
$user = new User(); // or User:create(['...']) directly
$user->name = 'toto';
// and all other data
or
$user = Auth::user();
then
$user->permissionsArray = PermissionHelper::permissionConverter($user->permissions);
$user->save();