<?php

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

class CreateDocablesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('docables', function (Blueprint $table) {
            $table->bigInteger('document_id')->unsigned();
            $table->morphs('docable');

            $table->unique(['document_id', 'docable_id', 'docable_type']);

            $table->foreign('document_id')->references('id')->on('documents')->onDelete('cascade');
        });
    }

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