invoiceninja/app/Providers/AppServiceProvider.php

<?php

namespace App\Providers;

use App\Models\Account;
use App\Models\Client;
use App\Models\Company;
use App\Models\CompanyToken;
use App\Models\Expense;
use App\Models\Invoice;
use App\Models\Payment;
use App\Models\Product;
use App\Models\Proposal;
use App\Models\Quote;
use App\Models\Task;
use App\Models\User;
use App\Observers\AccountObserver;
use App\Observers\ClientObserver;
use App\Observers\CompanyObserver;
use App\Observers\CompanyTokenObserver;
use App\Observers\ExpenseObserver;
use App\Observers\InvoiceObserver;
use App\Observers\PaymentObserver;
use App\Observers\ProductObserver;
use App\Observers\ProposalObserver;
use App\Observers\QuoteObserver;
use App\Observers\TaskObserver;
use App\Observers\UserObserver;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Support\Facades\Blade;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Relation::morphMap([
            'invoices' => '\App\Models\Invoice',
            'proposals' => '\App\Models\Proposal',
        ]);

        Blade::if('env', function($environment){
            return config('ninja.environment') === $environment;
        });

        Schema::defaultStringLength(191);

        User::observe(UserObserver::class);
        Account::observe(AccountObserver::class);
        Client::observe(ClientObserver::class);
        Company::observe(CompanyObserver::class);
        CompanyToken::observe(CompanyTokenObserver::class);
        Expense::observe(ExpenseObserver::class);
        Invoice::observe(InvoiceObserver::class);
        Payment::observe(PaymentObserver::class);
        Product::observe(ProductObserver::class);
        Proposal::observe(ProposalObserver::class);
        Quote::observe(QuoteObserver::class);
        Task::observe(TaskObserver::class);

    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->loadHelpers();
    }

    protected function loadHelpers()
    {
        foreach (glob(__DIR__.'/../Helpers/*.php') as $filename) {
            require_once $filename;
        }
    }
}