App\Ninja\Datatables\ActivityDatatable::columns PHP Method

    public function columns()
    {
        return [['activities.id', function ($model) {
            return Utils::timestampToDateTimeString(strtotime($model->created_at));
        }], ['activity_type_id', function ($model) {
            $data = ['client' => link_to('/clients/' . $model->client_public_id, Utils::getClientDisplayName($model))->toHtml(), 'user' => $model->is_system ? '<i>' . trans('texts.system') . '</i>' : Utils::getPersonDisplayName($model->user_first_name, $model->user_last_name, $model->user_email), 'invoice' => $model->invoice ? link_to('/invoices/' . $model->invoice_public_id, $model->is_recurring ? trans('texts.recurring_invoice') : $model->invoice)->toHtml() : null, 'quote' => $model->invoice ? link_to('/quotes/' . $model->invoice_public_id, $model->invoice)->toHtml() : null, 'contact' => $model->contact_id ? link_to('/clients/' . $model->client_public_id, Utils::getClientDisplayName($model))->toHtml() : Utils::getPersonDisplayName($model->user_first_name, $model->user_last_name, $model->user_email), 'payment' => $model->payment ?: '', 'credit' => $model->payment_amount ? Utils::formatMoney($model->credit, $model->currency_id, $model->country_id) : '', 'payment_amount' => $model->payment_amount ? Utils::formatMoney($model->payment_amount, $model->currency_id, $model->country_id) : null, 'adjustment' => $model->adjustment ? Utils::formatMoney($model->adjustment, $model->currency_id, $model->country_id) : null, 'task' => $model->task_public_id ? link_to('/tasks/' . $model->task_public_id, substr($model->task_description, 0, 30) . '...') : null, 'expense' => $model->expense_public_id ? link_to('/expenses/' . $model->expense_public_id, substr($model->expense_public_notes, 0, 30) . '...') : null];
            return trans("texts.activity_{$model->activity_type_id}", $data);
        }], ['balance', function ($model) {
            return Utils::formatMoney($model->balance, $model->currency_id, $model->country_id);
        }], ['adjustment', function ($model) {
            return $model->adjustment != 0 ? Utils::wrapAdjustment($model->adjustment, $model->currency_id, $model->country_id) : '';
        }]];
    }