如何在Laravel 5.1完整性约束违规中添加外键:1452?

时间:2016-10-19 05:56:10

标签: php mysql laravel

我正在为门票表添加外键。另一个表是 ticket_statuses

在工匠中,我执行了这个命令: php artisan make:migration add_ticket_status_to_tickets_table

这是迁移文件中的代码:

      class AddTicketStatusToTicketsTable extends Migration
    {
        /**
         * Run the migrations.
         *
         * @return void
         */
        public function up()
        {

            Schema::table('tickets', function ($table) {
                $table->integer('ticket_status_id')->unsigned();
                $table->foreign('ticket_status_id')->references('id')->on('ticket_statuses')->onDelete('cascade');
            });

        }
     }

之后,我尝试实现一种关系。这是我在门票模型

中的代码
class Ticket extends Model
{

    // Ticket __belongs_to__ Ticket Status
    public function ticket_status()
    {
        return $this->belongsTo('App\TicketStatus');
    }
}

在工匠中,我执行 php artisan migrate 但我遇到错误

[Illuminate\Database\QueryException]
  SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`idealcrmalphadb`.`#sql-4ea_1ce`, CONSTRAINT `tickets_ticket_status_id_foreign` FOREIGN KEY (`ticket_status_id`) REFERENCES `tickets` (`id`) ON DELETE CASCADE) (SQL: alter table `tickets` add constraint tickets_ticket_status_id_foreign foreignkey (`ticket_status_id`) references `tickets` (`id`) on delete cascade)

 [PDOException]
  SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`idealcrmalphadb`.`#sql-4ea_1ce`, CONSTRAINT `tickets_ticket_status_id_foreign` FOREIGN KEY (`ticket_status_id`) REFERENCES `tickets` (`id`) ON DELETE CASCADE)

我在模型部分犯了错误吗?请帮忙

1 个答案:

答案 0 :(得分:1)

检查迁移表名称和引用表名称。你这里有错误。

UPD:

看起来你已经在故障单表中有数据了。如果是这样,你现在可以尝试

$table->integer('ticket_status_id')->unsigned()->nullable();