how a replace returned values of model ?

Hi there... if i understand u right, u want to get some news and when u show them- to show truncated text.

1. So, u know how to get an article/news
2. U must print part of the content... in volt.

I will show u some way to do that: First: You need to make a plugin (helper) (not nessesery to follow my class names): to do that- u need to create a folder helpers (for example). Inside create file with name Volt.php that contain:

<?php

namespace Helpers;

class Volt
{
    static function truncateFilter($string, $length = 80, $etc = '...', $break_words = false, $middle = false)
    {
        $charset = 'UTF-8';
        $utf8_modifier = 'u';
        if ($charset != 'UTF-8') {
            $utf8_modifier = '';
        }

        if ($length == 0) return '';

        // Remove tags
        $string = strip_tags($string);

        // Go for it
        if (extension_loaded('mbstring')) {
            if (mb_strlen($string, $charset) > $length) {
                $length -= min($length, mb_strlen($etc, $charset));
                if (!$break_words && !$middle) {
                    $string = preg_replace('/\s+?(\S+)?$/' . $utf8_modifier, '', mb_substr($string, 0, $length + 1, $charset));
                }
                if (!$middle) {
                    return mb_substr($string, 0, $length, $charset) . $etc;
                }

                return mb_substr($string, 0, $length / 2, $charset) . $etc . mb_substr($string, - $length / 2, $length, $charset);
            }

            return $string;
        }

        // No MBString fallback
        if (isset($string[$length])) {
            $length -= min($length, strlen($etc));
            if (!$break_words && !$middle) {
                $string = preg_replace('/\s+?(\S+)?$/', '', substr($string, 0, $length + 1));
            }
            if (!$middle) {
                return substr($string, 0, $length) . $etc;
            }

            return substr($string, 0, $length / 2) . $etc . substr($string, - $length / 2);
        }

        return $string;
    }
}

Next: You need to include this plugin/helper to your project in loader- just for example: /See Helpers/

        $loader->registerNamespaces([
            'Controllers' => __DIR__ . '/controllers/',
            'Helpers' => __DIR__ . '/helpers/'
        ]);

Next: Give VOLT our extension: (example): /see Custom filter/

        /**
         * Setting up the view component
         */
        $di->set('view', function () use ($config) {

            $view = new View();
            $view->setViewsDir($config->application->viewsDir);

            $view->registerEngines([
                '.volt' => function ($view, $di) use ($config) {

                    $volt = new VoltEngine($view, $di);

                    $volt->setOptions([
                        'compileAlways' => $config->development, // This is mine development var xD
                        'compiledPath' => $config->application->appCacheDir."volt/",
                        'compiledSeparator' => '_'
                    ]);

                    // Custom filters
                    $volt->getCompiler()->addFilter('truncate', "\Helpers\Volt::truncateFilter");

                    return $volt;
                }
            ]);

            return $view;
        }, true);

So: we are almost ready :) If u make all parts work, u can use that helper in volt template like:

<p>{{ primary.content|truncate(90) }}</p>

...and u will got something like "text text text text text..." :)

I hope understand u well.

Good luck :)