Laravel 迁移自引用外键问题

问题描述

您好，我在使用迁移架构生成器创建表时遇到问题.具有自引用外键的表出现问题.这是产生错误的代码:

Hi I have a problem to create a table using migration schema builder.The problem occure with table with self referencing foreign key.Here is the code which produce error:

        Schema::create('cb_category', function($table)
    {
        $table->integer('id')->primary()->unique()->unsigned();
        $table->integer('domain_id')->unsigned();
        $table->foreign('domain_id')->references('id')->on('cb_domain');
        $table->integer('parent_id')->nullable();
        $table->foreign('parent_id')->references('id')->on('cb_category')->onUpdate('cascade')->onDelete('cascade');
        $table->string('name');
        $table->integer('level');
    });

这是错误:

  SQLSTATE[HY000]: General error: 1005 Can't create table 'eklik2.#sql-7d4_e' (errno: 150) (SQL: alter table `cb_cate

gory在 del 上添加约束 cb_category_parent_id_foreign 外键 (parent_id) 引用cb_category(id`)更新级联上的级联)(绑定:数组())

goryadd constraint cb_category_parent_id_foreign foreign key (parent_id) referencescb_category(id`) on del ete cascade on update cascade) (Bindings: array ( ))

[PDO异常]SQLSTATE[HY000]:一般错误:1005 无法创建表 'eklik2.#sql-7d4_e' (errno: 150)

[PDOException] SQLSTATE[HY000]: General error: 1005 Can't create table 'eklik2.#sql-7d4_e' (errno: 150)

有什么想法吗?

推荐答案

你必须把它分成两个 Schema 块，一个创建列，另一个添加 FK.mysql不能同时做这两件事.

You have to break this into two Schema blocks, one creating the columns, the other adding the FKs. mysql can't do both at the same time.

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