<?php

use App\Models\Study;
use App\Models\User;
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('study_assignments', function (Blueprint $table) {
            $table->id();
            $table->foreignIdFor(Study::class)->constrained()->cascadeOnDelete();
            $table->foreignIdFor(User::class)->nullable()->constrained()->nullOnDelete();
            $table->timestamps();

            $table->unique(['study_id', 'user_id']);
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('study_assignments');
    }
};