Mysql 错误：外键约束格式不正确

我的HOOFDVRAAGS数据库中有外键错误，但奇怪的是，这与VRAAGS中的外键错误完全相同

SQLSTATE[HY000]：一般错误：1005无法创建表

zonetets

#sql-1 e8_2f9

（错误号：150“外键约束为 格式不正确”）（SQL:lter表

hoofdvraags

add约束

hoofdvraags\u-toets\u-id\u-foreign键（
toets\u-id
）参考
toets
（
id
）位于Connection.php第458行：

SQLSTATE[HY000]：一般错误：1005无法创建表
zonetets
#sql-1 e8_2f9
（错误号：150“外键约束为
格式不正确的“）

我的db迁移到此，希望有人能帮助我。
在此，关系
TOETS1--->NHOOFDVRAAGS1--->NVRAAGS

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateToetsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('toets', function (Blueprint $table) {
            $table->increments('id');
            $table->string('toetscode');
            $table->string('jaargang');
            $table->string('vak')->default('wiskunde');
            $table->string('hoofdstuk');
            $table->string('hoofdstuktitel');
            $table->string('maker');
            $table->string('datumgemaakt');   
            $table->integer('volgnummerToets')->default(1);     
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('toets');
    }
}

public function hoofdvraag()
    {
        return $this->hasMany(Hoofdvraag::class);
    }

HOOFDVRAAGS

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateHoofdvraagsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('hoofdvraags', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('toets_id')->unsigned();
            $table->string('titel');
            $table->string('tekst');
            $table->string('bestandsnaam');
            $table->integer('volgnummerHoofdvraag')->default(99);             
            $table->timestamps();

            $table->foreign('toets_id')
                -> references('id')
                -> on('toets')
                -> onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('hoofdvraags');
    }
}

型号HOOFDVRAAG

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateSubvraagsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('subvraags', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('hoofdvraag_id')->unsigned();
            $table->string('vraag');
            $table->string('antwoord');
            $table->integer('punten');
            $table->string('bestandsnaam');
            $table->integer('volgnummerSubvraag')->default(1);
            $table->timestamps();

            $table->foreign('hoofdvraag_id')
                -> references('id')
                -> on('hoofdvraags')
                -> onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('subvraags');
    }
}

public function subvraag()
    {
        return $this->hasMany(Subvraag::class);
    }

    public function toets() {
        return $this->belongsTo(Toets::class);
    }

public function hoofdvraag() {
        return $this->belongsTo(Hoofdvraag::class);
    }

型号SUBVRAAG

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateSubvraagsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('subvraags', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('hoofdvraag_id')->unsigned();
            $table->string('vraag');
            $table->string('antwoord');
            $table->integer('punten');
            $table->string('bestandsnaam');
            $table->integer('volgnummerSubvraag')->default(1);
            $table->timestamps();

            $table->foreign('hoofdvraag_id')
                -> references('id')
                -> on('hoofdvraags')
                -> onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('subvraags');
    }
}

public function subvraag()
    {
        return $this->hasMany(Subvraag::class);
    }

    public function toets() {
        return $this->belongsTo(Toets::class);
    }

public function hoofdvraag() {
        return $this->belongsTo(Hoofdvraag::class);
    }

正如我所知，如果您在模型中创建了一个有说服力的关系，那么您为什么要在迁移中创建外键，您所需要的就是为它创建一个列

这是执行顺序吗？您需要确保创建
toets
，然后创建
hoofdvraags
然后创建
subvraags
。您还可以对表名使用普通的复数形式，只需定义
protected$table='hoodvragen'在您的modelFlame中，谢谢我已经更改了执行顺序，现在没有任何错误，非常感谢！我是拉威尔的新手，我想你可能是对的，但问题已经为我解决了，但稍后我会更仔细地看一看。谢谢