codigo actual del servidor, con avances de joan

app/Models/Customer.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Customer extends Model
+{
+    protected $fillable = [
+      'user_id',
+    ];
+    public function user(){
+    	return $this->belongsTo(User::class);
+    }
+}