errno：150“外键约束格式不正确”-bigIncrements

Question

当我更改为时，出现此错误bigIncrements：

.`products` (errno: 150 "Foreign key constraint is incorrectly formed")

我的代码：

public function up()
{
    Schema::create('products', function (Blueprint $table) {
        $table->bigIncrements('id')->unsigned();
        $table->string('title');
        $table->integer('current_buy');
        $table->integer('count');
        $table->text('short_description');
        $table->text('long_description');
        $table->tinyInteger('status')->default(0);
        $table->string('series');
        $table->integer('max_buy');
        $table->integer('parent_product_id')->nullable()->unsigned();
        $table->foreign('parent_product_id')->references('id')->on('products')->onDelete('cascade');
        $table->tinyInteger('admin_seen')->default(0);
        $table->timestamps();
    });

    DB::update("ALTER TABLE products AUTO_INCREMENT = 1000;");
}

但是下面的代码可以正常工作；

public function up()
{
    Schema::create('products', function (Blueprint $table) {
        $table->increments('id');
        $table->string('title');
        $table->integer('current_buy');
        $table->integer('count');
        $table->text('short_description');
        $table->text('long_description');
        $table->tinyInteger('status')->default(0);
        $table->string('series');
        $table->integer('max_buy');
        $table->integer('parent_product_id')->nullable()->unsigned();
        $table->foreign('parent_product_id')->references('id')->on('products')->onDelete('cascade');
        $table->tinyInteger('admin_seen')->default(0);
        $table->timestamps();
    });

   // DB::update("ALTER TABLE products AUTO_INCREMENT = 1000;");
}

Answer 1

由于您使用的bigIncrements()是id，要使其正常运行，请对此进行更改：

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

对此：

$table->bigInteger('parent_product_id')->nullable()->unsigned();