invoiceninja/app/Ninja/Datatables/ProductDatatable.php

<?php

namespace App\Ninja\Datatables;

use Auth;
use Str;
use URL;
use Utils;

class ProductDatatable extends EntityDatatable
{
    public $entityType = ENTITY_PRODUCT;
    public $sortCol = 4;

    public function columns()
    {
        $account = Auth::user()->account;

        return [
            [
                'product_key',
                function ($model) {
                    return link_to('products/'.$model->public_id.'/edit', $model->product_key)->toHtml();
                },
            ],
            [
                'notes',
                function ($model) {
                    return $this->showWithTooltip($model->notes);
                },
            ],
            [
                'cost',
                function ($model) {
                    return Utils::formatMoney($model->cost);
                },
            ],
            [
                'tax_rate',
                function ($model) {
                    return $model->tax_rate ? ($model->tax_name . ' ' . $model->tax_rate . '%') : '';
                },
                $account->invoice_item_taxes,
            ],
            [
                'custom_value1',
                function ($model) {
                    return $model->custom_value1;
                },
                $account->custom_invoice_item_label1
            ],
            [
                'custom_value2',
                function ($model) {
                    return $model->custom_value2;
                },
                $account->custom_invoice_item_label2
            ]
        ];
    }

    public function actions()
    {
        return [
            [
                uctrans('texts.edit_product'),
                function ($model) {
                    return URL::to("products/{$model->public_id}/edit");
                },
            ],
            [
                trans('texts.invoice_product'),
                function ($model) {
                    return "javascript:submitForm_product('invoice', {$model->public_id})";
                },
                function ($model) {
                    return (! $model->deleted_at || $model->deleted_at == '0000-00-00') && Auth::user()->can('create', ENTITY_INVOICE);
                },
            ],
        ];
    }
}