adding a cart

app/Models/User.php

@@ -7,6 +7,7 @@ use Database\Factories\UserFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Attributes\Hidden;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Fortify\TwoFactorAuthenticatable;
@@ -18,6 +19,11 @@ class User extends Authenticatable
     /** @use HasFactory<UserFactory> */
     use HasFactory, Notifiable, TwoFactorAuthenticatable;
 
+    public function cart(): HasOne
+    {
+        return $this->hasOne(Cart::class);
+    }
+
     /**
      * Get the attributes that should be cast.
      *