update logic

database/migrations/2021_07_10_000000_add_subarticles.php

@@ -0,0 +1,37 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Capsule\Manager as Capsule;
+
+class AddSubarticles extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $builder = Capsule::schema();
+
+        $builder->table('articles', function($table) {
+
+            $table->unsignedInteger('main_article_id')->nullable();
+            $table->foreign('main_article_id')->references('id')->on('articles');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        $builder = Capsule::schema();
+
+        $builder->table('articles', function($table) {
+            $table->dropColum('main_article_id');
+        });
+    }
+}