尝试在 Laravel 上建立关系时出现问题

Question

我在尝试进行迁移时遇到问题。我有一个事件表和一个颜色表。我已经尝试使用 Tinker 在这些表之间建立关系并且没有问题，但是当我使用 PhpmyAdmin 单击 id （查看它是什么字段）时，我无法做到，因为这些表之间没有链接。这是我的两次迁移：

第一次迁移：

//Event migration

<?php

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

class EventList extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('events', function (Blueprint $table) {
            $table->increments('id');
            $table->string('nom', 45);
            $table->integer('couleur_id')->unsigned()->index();
            $table->integer('annee_cours_id')->unsigned()->index();
        });
        Schema::enableForeignKeyConstraints('events', function (Blueprint $table){
            $table->foreign('couleur_id')->references('id')->on('couleurs');
            $table->foreign('annee_cours_id')->references('id')->on('annee_cours');
        });
    }

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

第二次迁移：

//Color migration

<?php

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

class Couleur extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('couleurs', function (Blueprint $table){
           $table->increments('id');
           $table->string('nom', 45);
           $table->string('code_hexa', 45);
        });
    }

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

我实际上是在使用 PhpmyAdmin 概念（如下图所示）来更轻松地建立关系，但我想只使用代码来执行相同的操作。是否有解决方案可以在 Laravel 上轻松完成此操作而不使用 PhpmyAdmin 概念？

提前感谢您的回答。

Picture of a relationship example on PhpmyAdmin

编辑：使用php artisan migrate --pretend 后，我得到了一些描述迁移的确切内容的行。有输出：

QuadrimestreList: create table `quadrimestres` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventHasTypeEvent: create table `event_has_type_events` (`Event_id` int unsigned not null, `type_event_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventHasTypeEvent: alter table `event_has_type_events` add index `event_has_type_events_event_id_index`(`Event_id`)
EventHasTypeEvent: alter table `event_has_type_events` add index `event_has_type_events_type_event_id_index`(`type_event_id`)
EventHasTypeEvent: SET FOREIGN_KEY_CHECKS=1;
EventList: create table `events` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null, `couleur_id` int unsigned not null, `annee_cours_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventList: alter table `events` add index `events_couleur_id_index`(`couleur_id`)
EventList: alter table `events` add index `events_annee_cours_id_index`(`annee_cours_id`)
EventList: SET FOREIGN_KEY_CHECKS=1;
EventHasQuadrimestre: create table `event_has_quadrimestres` (`Event_id` int unsigned not null, `quadrimestre_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventHasQuadrimestre: alter table `event_has_quadrimestres` add index `event_has_quadrimestres_event_id_index`(`Event_id`)
EventHasQuadrimestre: alter table `event_has_quadrimestres` add index `event_has_quadrimestres_quadrimestre_id_index`(`quadrimestre_id`)
EventHasQuadrimestre: SET FOREIGN_KEY_CHECKS=1;
EventHasLocal: create table `event_has_locals` (`Event_id` int unsigned not null, `local_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventHasLocal: alter table `event_has_locals` add index `event_has_locals_event_id_index`(`Event_id`)
EventHasLocal: alter table `event_has_locals` add index `event_has_locals_local_id_index`(`local_id`)
EventHasLocal: SET FOREIGN_KEY_CHECKS=1;
EventHasEnseignant: create table `event_has_enseignants` (`Event_id` int unsigned not null, `enseignant_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
EventHasEnseignant: alter table `event_has_enseignants` add index `event_has_enseignants_event_id_index`(`Event_id`)
EventHasEnseignant: alter table `event_has_enseignants` add index `event_has_enseignants_enseignant_id_index`(`enseignant_id`)
EventHasEnseignant: SET FOREIGN_KEY_CHECKS=1;
Enseignant: create table `enseignants` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
Couleur: create table `couleurs` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null, `code_hexa` varchar(45) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
AnneeCours: create table `annee_cours` (`id` int unsigned not null auto_increment primary key, `nom` varchar(255) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
Horaire: create table `horaires` (`id` int unsigned not null auto_increment primary key, `nom` varchar(255) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
Local: create table `locals` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null, `commentaire` varchar(255) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
Reservation: create table `reservations` (`id` int unsigned not null auto_increment primary key, `numero_semaine` int not null, `date` datetime not null, `heure_debut` varchar(45) not null, `heure_fin` varchar(45) not null, `Event_id` int unsigned not null, `horaire_id` int unsigned not null, `local_id` int unsigned not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'
Reservation: alter table `reservations` add index `reservations_event_id_index`(`Event_id`)
Reservation: alter table `reservations` add index `reservations_horaire_id_index`(`horaire_id`)
Reservation: alter table `reservations` add index `reservations_local_id_index`(`local_id`)
Reservation: SET FOREIGN_KEY_CHECKS=1;
TypeEvent: create table `type_events` (`id` int unsigned not null auto_increment primary key, `nom` varchar(45) not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci'

别担心其他表，它们的问题与“Event”和“Couleurs”表相同。我认为这是关于外键的问题，但我看不出问题出在哪里。输出有用吗？

编辑 2：好的，它看起来更好，但是当我查看 PhpmyAdmin 概念时，表之间没有关系。我不知道这是否正常，也许 PhpmyAdmin 不像 Laravel 迁移那样识别关系？对不起，如果我需要这么多帮助。

Answer 1

使用“Schema::table(...)“, 和不 Schema::enableForeignKeyConstraints

它应该可以工作......