チェックインの編集は本人のみ可能

app/Policies/EjaculationPolicy.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Policies;
+
+use App\Ejaculation;
+use App\User;
+use Illuminate\Auth\Access\HandlesAuthorization;
+
+class EjaculationPolicy
+{
+    use HandlesAuthorization;
+
+    /**
+     * Create a new policy instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    public function edit(User $user, Ejaculation $ejaculation): bool
+    {
+        return $user->id === $ejaculation->user_id;
+    }
+}