How to make a unified method for store and update models?

Question

Laravel

Good afternoon!
How to competently unify the function for the store and update methods of the model, if the form data is stored in almost the same uniform code?
Differences: in function store new is used, and in update - element with index id is initially searched through findorFail
What is the best practice in your opinion?

Answer 1

public function storeOrUpdate($id = null,  array $fields){
   $model = $id !== null ? Model::findOrFail($id) : new Model();
}

Answer 2

In the store method we specify:

$model = new Model();
$this->update($request, $model);