Laravel get all with same id
<p>I have a table with category_id. Category_id can has 1,2,3 or 4 as a value. Now I want to show all results with value 1. How do i do it in this code? Thanks.</p>

<pre><code>public function getshopGSM()
{
    $shopGSM = new Product();
    $shopGSM = Product::all();
    return view('eindwerk.shopGSM', [
        'shopGSM' =&gt; $shopGSM
    ]);
}
</code></pre>