How do I reload a relation collection in laravel?

You can easily tell laravel to load a relation with a single command:

$model->load('relation');

Will tell it to refresh the relation collection, and $model->relation will now show the correct values.

Also unloading a relation will be like this:

$model->unsetRelation('relation')

either just unset it and let the system reload on demand.

unset($model->relation)

or

$model->unsetRelation('relation');

And let it be loaded on request.

Conclusion: three solutions in here

$model->load('relation');

unset($model->relation);

$freshCollection = $user->roles()->get();`

It is possible to use Eloquent query builder:

$freshCollection = $user->roles()->get();

If you want to force all your relations to reload on an as-needed basis and you're inside your model, you can use:

$this->relations = [];