firefly-iii/database/migrations/2015_05_28_041652_entrust_setup_tables.php

<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

/**
 * Class EntrustSetupTables
 *
 * @SuppressWarnings(PHPMD.ShortMethodName)
 * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
 */
class EntrustSetupTables extends Migration
{
    /**
     * Reverse the migrations.
     *
     * @return  void
     */
    public function down()
    {
        Schema::drop('permission_role');
        Schema::drop('permissions');
        Schema::drop('role_user');
        Schema::drop('roles');
    }

    /**
     * Run the migrations.
     *
     * @return  void
     */
    public function up()
    {
        // Create table for storing roles
        Schema::create(
            'roles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->unique();
            $table->string('display_name')->nullable();
            $table->string('description')->nullable();
            $table->timestamps();
        }
        );

        // Create table for associating roles to users (Many-to-Many)
        Schema::create(
            'role_user', function (Blueprint $table) {
            $table->integer('user_id')->unsigned();
            $table->integer('role_id')->unsigned();

            $table->foreign('user_id')->references('id')->on('users')
                  ->onUpdate('cascade')->onDelete('cascade');
            $table->foreign('role_id')->references('id')->on('roles')
                  ->onUpdate('cascade')->onDelete('cascade');

            $table->primary(['user_id', 'role_id']);
        }
        );

        // Create table for storing permissions
        Schema::create(
            'permissions', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->unique();
            $table->string('display_name')->nullable();
            $table->string('description')->nullable();
            $table->timestamps();
        }
        );

        // Create table for associating permissions to roles (Many-to-Many)
        Schema::create(
            'permission_role', function (Blueprint $table) {
            $table->integer('permission_id')->unsigned();
            $table->integer('role_id')->unsigned();

            $table->foreign('permission_id')->references('id')->on('permissions')
                  ->onUpdate('cascade')->onDelete('cascade');
            $table->foreign('role_id')->references('id')->on('roles')
                  ->onUpdate('cascade')->onDelete('cascade');

            $table->primary(['permission_id', 'role_id']);
        }
        );
    }
}