Simple controller model update in Laravel.

update-example.php

<?php
/**
* Update the specified resource in storage.
*
* @param \Illuminate\Http\Request $request
* @param \App\Product $product
*
* @return \Illuminate\Http\Response
*/
public function update(Request $request, Product $product)
{
    $this->validate($request, [
        'name' => 'required|max:255',
        'price' => 'required|numeric',
    ]);

    $product->update(
        $request->only('name', 'price')
    );

    return back()->with('status', 'The product was updated!');
}