<?php

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

return new class extends Migration
{
    /**
     * Run the migrations.
     */
    public function up(): void
    {
        Schema::table('articles', function (Blueprint $table) {
            // 阿诺提醒：morphs('oSubject') 会生成 oSubject_id 和 oSubject_type
            // 并且会自动建立复合索引，非常扎实！
            $table->morphs('oSubject');
            
            // 如果你之前已经有数据了，建议给这两个字段允许 null，防止迁移报错
            // $table->morphs('oSubject')->nullable();
        });
    }

    /**
     * Reverse the migrations.
     */
    public function down(): void
    {
        Schema::table('articles', function (Blueprint $table) {
            // 降级操作：把这两个字段和索引一并撤销，保持数据库清爽
            $table->dropMorphs('oSubject');
        });
    }
};