geolook/database/migrations/2019_02_27_102408_groups_users.php

<?php

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

class GroupsUsers extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('groups_users', function (Blueprint $table) {
            $table->unsignedInteger('user_id');
            $table->foreign('user_id', 'fk_users')
                ->references('id')
                ->on('users')
                ->onDelete('cascade');
            $table->unsignedInteger('group_id');
            $table->foreign('group_id', 'fk_groups')
                ->references('id')
                ->on('groups')
                ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('groups_users', function (Blueprint $table) {
            $table->dropForeign('fk_users');
            $table->dropForeign('fk_groups');
        });
        Schema::dropIfExists('groups_users');
    }
}