はじめに
php artisan make:migration create_categories_table
php artisan make:migration create_articles_table
php artisan make:migration create_article_categories_table
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateCategoriesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('categories', function (Blueprint $table) {
$table->id();
$table->string('name');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('categories');
}
}
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateArticlesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('articles', function (Blueprint $table) {
$table->id();
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->string('title');
$table->text('body');
$table->string('tag')->nullable();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('articles');
}
}
- article_categoriesテーブルのファイル
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateArticleCategoriesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('article_categories', function (Blueprint $table) {
$table->id();
$table->unsignedBigInteger('category_id');
$table->foreign('category_id')->references('id')->on('categories')->onDelete('cascade');
$table->unsignedBigInteger('article_id');
$table->foreign('article_id')->references('id')->on('articles')->onDelete('cascade');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('article_categories');
}
}
$ php artisan migrate
Migrating: 2020_10_02_091649_create_categories_table
Migrated: 2020_10_02_091649_create_categories_table (147.28ms)
Migrating: 2020_10_02_091655_create_articles_table
Migrated: 2020_10_02_091655_create_articles_table (228.39ms)
Migrating: 2020_10_02_091659_create_article_categories_table
Migrated: 2020_10_02_091659_create_article_categories_table (404.55ms)
テーブルの作成の確認
- テーブルも外部制約が付与された状態で作成されている
| categories | CREATE TABLE `categories` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci |
| articles | CREATE TABLE `articles` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`user_id` bigint(20) unsigned NOT NULL,
`title` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
`body` text COLLATE utf8mb4_unicode_ci NOT NULL,
`tag` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `articles_user_id_foreign` (`user_id`),
CONSTRAINT `articles_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci |
| article_categories | CREATE TABLE `article_categories` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`category_id` bigint(20) unsigned NOT NULL,
`article_id` bigint(20) unsigned NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `article_categories_category_id_foreign` (`category_id`),
KEY `article_categories_article_id_foreign` (`article_id`),
CONSTRAINT `article_categories_article_id_foreign` FOREIGN KEY (`article_id`) REFERENCES `articles` (`id`) ON DELETE CASCADE,
CONSTRAINT `article_categories_category_id_foreign` FOREIGN KEY (`category_id`) REFERENCES `categories` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci |
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