php - 错误号 : 150 "Foreign key constraint is incorrectly formed" how can i fix this?

Question

我一直在以不同的方式尝试它，但我无法消除错误。所以我的问题是:其他人能看出错误吗？

这是我的代码:

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->bigIncrements('id')->unique();
        $table->boolean('admin')->default('0');
        $table->string('name');
        $table->string('email')->unique();
        $table->timestamp('email_verified_at')->nullable();
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();
    });
}


public function up()
{
    Schema::create('places', function (Blueprint $table) {
        $table->bigIncrements('id')->unique();
        $table->string('location_name');
        $table->string('village');
        $table->string('street');
        $table->integer('number')->unsigned();
    });
}

public function up()
{
    Schema::create('planning', function (Blueprint $table) {
        $table->bigIncrements('id')->unique();
        $table->unsignedInteger('places_id');
        $table->time('van');
        $table->time('tot');
        $table->date('dag');
        $table->timestamps();
        $table->unsignedInteger('created_by');

        $table->foreign('places_id')
            ->references('id')
            ->on('places')
            ->onDelete('cascade');

        $table->foreign('created_by')
            ->references('id')
            ->on('users')
            ->onDelete('cascade');
    });

}

PDOException::("SQLSTATE[HY000]: General error: 1005 Can't create table `foodtruck`.`#sql-3be8_b8` (errno: 150 "Foreign key constraint is incorrectly formed" )")

我希望此错误消息保留我的命令行和我的迁移文件，以我可以正常使用的方式进行修复:)

Answer 1

因为 places_id 和 created_by 被定义为 bigIncrements，你不能将它们的外键定义为它需要的 unsignedInteger是根据documentation对应的数据类型是:

Auto-incrementing UNSIGNED BIGINT (primary key) equivalent column.

相当于 unsignedBigInteger。

改变，

$table->unsignedInteger('places_id');
$table->unsignedInteger('created_by');

为了，

$table->unsignedBigInteger('places_id');
$table->unsignedBigInteger('created_by');