factory (App\Models\UserAddress::class, 3)->create (['user_id' => 1]) 报错？

<?php

use Faker\Generator as Faker;

$factory->define(App\Models\UserAddress::class, function (Faker $faker) {
    $addresses = [
        ["北京市", "市辖区", "东城区"],
        ["河北省", "石家庄市", "长安区"],
        ["江苏省", "南京市", "浦口区"],
        ["江苏省", "苏州市", "相城区"],
        ["广东省", "深圳市", "福田区"],
    ];
    $address   = $faker->randomElement($addresses);

    return [
        'province'      => $address[0],
        'city'          => $address[1],
        'district'      => $address[2],
        'address'       => sprintf('第%d街道第%d号', $faker->randomNumber(2), $faker->randomNumber(3)),
        'zip'           => $faker->postcode,
        'contact_name'  => $faker->name,
        'contact_phone' => $faker->phoneNumber,
    ];
});

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class UserAddress extends Model
{
    //
    protected $fillable = [
        'province',
        'city',
        'district',
        'address',
        'zip',
        'contact_name',
        'contact_phone',
        'last_used_at',
    ];

    protected $dateFormat = ['last_used_at'];

    public function user()
    {
        return $this->belongsTo(User::class);
    }

    public function getFullAddressAttribute()
    {
        return "{$this->province}{$this->city}{$this->district}{$this->address}";
    }
}