我在Laravel 10中的一对一关系有什么错误

我是拉拉维尔的新手。我尝试创建具有一对一关系的模型。 但当我去测试它时,它会给我一个错误:

Illuminate\Database\QueryException:SQLSTATE[23000]:完整性 约束冲突:1452无法添加或更新子行:外部 关键点约束失败( belajar_laravel_eloquent 。 wallets ,约束 wallets_customer_id_foreign 外键( customer_id )参考文献 customers ( id ))(连接:mysql,SQL:插入 钱包 ( amount , customer_id )值(5700000,0)

怎么了?

这是我的桌子:

Schema::create('customers', function (Blueprint $table) {
            $table->string('id', 100)->primary();
            $table->string('name', 100);
            $table->string('email', 100)->unique('customer_email');
        });

Schema::create('wallets', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('customer_id', 100);
        $table->bigInteger('amount')->default(0);
        $table->foreign('customer_id')->on('customers')->references('id');
    });

这是我的模型:

class Customer extends Model
{
    public $timestamps = false;
    public function wallet(): HasOne
    {
        return $this->hasOne(Wallet::class, 'customer_id', 'id');
    }   
}

这是我的模型:

class Wallet extends Model
{
    public $timestamps = false;

    public function customer(): BelongsTo
    {
        return $this->BelongsTo(Customer::class, 'customer_id', 'id');
    }
}

这是我的测试:

public function testOneToOneQueryRelation()
    {
        $customer = new Customer();
        $customer->id = 'Rinam';
        $customer->name = 'Rinam';
        $customer->email = 'RinamSayang@gmail.com';
        $customer->save();

        $wallet = new Wallet();
        $wallet->amount = 5700000;

        $customer->wallet()->save($wallet);
        self::assertNotNull($wallet->customer_id);
    }