liwo/database/seeds/BusinessSeeder.php

<?php

use App\Business;
use App\User;
use App\Project;
use App\System;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Seeder;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\DB;

class BusinessSeeder extends Seeder
{
    public function run()
    {
        Business::insert(factory(Business::class, 2000)->raw());
        $projects = [];
        $systems = [];
        $business_user = [];
        $project_user = [];
        $project_id = 0;
        for ($business_id=1; $business_id <= 2000; $business_id++) {
            // distinct user ids
            $user_ids = [];
            $added_user = [];
            for ($i=0; $i < 10; $i++) $user_ids [] = rand(1, 5000);
            $user_ids = array_values(array_unique($user_ids));
            // add 1 to 7 member
            for ($i=0; $i < rand(1, 8); $i++) {
                $added_user[] = $user_ids[$i];
                $business_user[] = [
                    'business_id' => $business_id,
                    'user_id' => $user_ids[$i],
                    'level' => $i == 0? 4: rand(0, 4),
                ];
            }

            $business_projects = factory(Project::class, rand(1, 3))->raw();
            foreach ($business_projects as $project) {
                $project['business_id'] = $business_id;
                $projects[] = $project;
                $project_id++;

                for ($i=0; $i < rand(0, 2); $i++) {
                    if ($added_user[$i] ?? false) {
                        $project_user[] = [
                            'project_id' => $project_id,
                            'user_id' => $added_user[$i],
                            'level' => rand(0, 4),
                        ];
                    }
                }

                for ($i=0; $i < rand(1, 5); $i++) {
                    $systems[] = factory(System::class)->raw([
                        'project_id' =>  $project_id,
                        'business_id' => $business_id,
                    ]);
                }
            }

            // for ($i=0; $i < rand(1, 3); $i++) {
            //     // $project =
            // }
        //     $business_user[] = [
        //         'business_id' => $business_id,
        //         'user_id' => 1,
        //         'owner' => true,
        //     ];
        }
        DB::table('business_user')->insert($business_user);
        Project::insert($projects);
        DB::table('project_user')->insert($project_user);
        DB::table('systems')->insert($systems);
        /**
         * Every business has one or more owners, which might be the owner of other business as well
         */
        // $this->insertAdmins($business_ids, $owners);


        /**
         * Every business has one or more members, which might be the member of other business as well
         */
        // $this->insertMembers($business_ids);
    }

    /**
     * @param $business_ids
     * @param Collection $owners
     * @return array
     */
    public function insertAdmins($business_ids, Collection $owners)
    {
        $relations = [];
        foreach ($business_ids as $id) {
            $relations[] = [
                'business_id' => $id,
                'user_id' => $owners->random()->id,
                'owner' => true,
            ];
        }

        // Specify the percentage of managers who have two or more businesses
        $multiple = ceil(count($relations) / 100 * 30);
        foreach (Arr::random($relations, $multiple) as $relation) {
            $relations[] = [
                'business_id' => $relation['business_id'],
                'user_id' => $owners->except($relation['user_id'])->random()->id,
                'owner' => true,
            ];
        }

        DB::table('business_user')->insert($relations);
    }

    /**
     * @param $business_ids
     */
    public function insertMembers($business_ids): void
    {
        /** @var Collection $member_ids */
        $member_ids = User::whereDoesntHave('businesses')->select('id')->pluck('id');
        $relations = [];
        $current = [];
        foreach ($member_ids as $index => $id) {
            $relations[] = [
                'business_id' => $business = $business_ids->random(),
                'user_id' => $id,
            ];

            $current[$business][] = $index;
        }

        $multiple = ceil(count($relations) / 100 * 20);
        foreach (Arr::random($relations, $multiple) as $relation) {
            $relations[] = [
                'business_id' => $relation['business_id'],
                'user_id' => $member_ids->except($current[$relation['business_id']])->random(),
            ];
        }

        DB::table('business_user')->insert($relations);
    }
}