<?php

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

class CreateUserQuestionAnswersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('user_question_answers', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('user_id');
            $table->unsignedBigInteger('question_id');
            $table->unsignedBigInteger('question_answer_id')->nullable();
            $table->timestamps();

            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->foreign('question_id')->references('id')->on('questions')->onDelete('cascade');
            $table->foreign('question_answer_id')->references('id')->on('question_answers')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('user_question_answers', function (Blueprint $table) {
            $table->dropForeign('user_question_answers_user_id_foreign');
            $table->dropForeign('user_question_answers_question_id_foreign');
            $table->dropForeign('user_question_answers_question_answer_id_foreign');
        });

        Schema::dropIfExists('user_question_answers');
    }
}