invoiceninja/app/Models/InvoiceDesign.php

<?php namespace app\Models;

use Eloquent;
use Auth;

class InvoiceDesign extends Eloquent
{
    public $timestamps = false;

    public function scopeAvailableDesigns($query)
    {
        $designs = $query->where('id', '<=', \Auth::user()->maxInvoiceDesignId())->orderBy('id')->get();

        foreach ($designs as $design) {                            
            $fileName = public_path(strtolower("js/templates/{$design->name}.js"));
            if (Auth::user()->account->utf8_invoices && file_exists($fileName)) {
                $design->javascript = file_get_contents($fileName);
            }
        }

        return $designs;
    }
}