Question

我有一个带有外键的简单laravel迁移。

public function up()
{
    Schema::create('smp_posts', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('project_id')->unsigned();
        // Some other stuff
        $table->foreign('project_id')->references('id')->on('smp_projects')->onDelete('cascade');
    });
}

当我运行迁移命令php artisan migrate:refresh时。我收到此错误：

Illuminate \ Database \ QueryException：

SQLSTATE [2BP01]：依赖对象仍然存在：7

错误：无法删除表smp_projects，因为其他对象依赖该表       详细信息：对表smp_posts的约束smp_posts_project_id_foreign取决于表smp_projects

通常所有的孩子都应该删除，因为我将onDelete()设置为层叠。对？怎么了？

Answer 1

您设置的File ".../venv/lib/python2.7/site-packages/werkzeug/test.py", line 923, in run_wsgi_app app_rv = app(environ, start_response) TypeError: function takes exactly 1 argument (2 given) The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a Connection.选项仅在删除行时适用。如果删除该表时未触发约束，这就是为什么会出现错误。

您应该看一下Postgres文档的Dependency Tracking部分

Laravel迁移onDelete（）查询异常

1 个答案: