SQLSTATE[23000]：违反完整性约束：1452 无法在 Laravel9 中添加或更新子行

Question

我在 Laravel 9 中运行命令 php artisan db:seed 时违反了完整性约束。

错误

PDOException::("SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (hunger-db.restaurants, CONSTRAINT restaurants_user_id_foreign FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE)")

setup_users_table

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->id();
        $table->string('name');
        $table->string('email')->unique();
        $table->timestamp('email_verified_at')->nullable();
        $table->string('password');
        $table->string('phone');
        $table->tinyInteger('role_as')->default('0');
        $table->tinyInteger('gender')->default('0');
        $table->string('date_of_birth')->default('1999/9/9');
        $table->rememberToken();

        $table->timestamps();
    });
}

setum_restaurants_table

public function up()
{
    Schema::create('restaurants', function (Blueprint $table) {
        $table->id();
        $table->string('name');
        $table->string('img_src');
        $table->string('description');
        $table->string('minimum_order_amount');
        $table->string('working_hours_open');
        $table->string('working_hours_close');
        $table->string('delivery_time');
        $table->string('delivery_fee');
        $table->boolean('status')->default('0');
        $table->unsignedBigInteger('user_id')->default('1');
        $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        $table->timestamps();
    });
}

用户模型

class User extends Authenticatable
{
    use HasApiTokens, HasFactory, Notifiable;

    protected $fillable = [
        'name',
        'email',
        'password',
        'phone',
    ];

    public function orders()
    {
        return $this->hasMany(Order::class);
    }

    public function restaurants()
    {
        return $this->belongsTo(Restaurant::class);
    }
}

餐厅模特

class Restaurant extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'img_src',
        'description',
    ];
    public function users()
    {
        return $this->belongsTo(User::class);
    }
}

Answer 1

查看您添加到餐厅table的user_id。确保它存在于 Users table 中。可能是我的英文不足以告诉你，可以再找一个answer找问题。

Answer 2

我看到这里有些东西需要改变

setup_restaurants_table

我看不太清楚 user_id 默认值为 1，也许最好在创建餐厅时定义值或手动将其分配给用户 1。

Schema::create('restaurants', function (Blueprint $table) {
        $table->id();
        ...
        $table->foreignId('user_id')->constrained()->onDelete('CASCADE');
});

数据库更改后运行 php artisan migrate:fresh

User.php

应该改变与 hasMany 餐厅的关系

public function restaurants()
{
    return $this->hasMany(Restaurant::class);
}

播种

还要确保您的数据库播种正确，我的意思是先创建用户，然后再创建餐厅，使用现有值设置 user_id。

也许创建这样的餐厅：

$user = User::factory()
            ->hasRestaurants(3)
            ->create();

如有工厂变更运行php artisan db:seed

还能看到Factory Retationship Docs

SQLSTATE[23000]：违反完整性约束：1452 无法在 Laravel9 中添加或更新子行

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row in Laravel9

php

mysql

foreign-keys

laravel

laravel-9

setup_restaurants_table

User.php

播种