BuddiesListPage.php

<?php namespace AuthorPLugin\PLuginName\Components;

use Cms\Classes\ComponentBase;
use Lovata\Buddies\Models\User;

class BuddiesListPage extends ComponentBase
{
    public function componentDetails()
    {
        return [
            'name'        => 'BuddiesPage ',
            'description' => ''
        ];
    }

    public function defineProperties()
    {
            return [
                'slug' => [
                    'title' => 'Buddies slug',
                    'type' => 'string'
                ]
            ];
    }

    public function onRun()
    {
        $sElementID = $this->param('slug');
        if (empty($sElementID)) {
            $this->page['arBuddiesList'] = User::all();
        } else {
            $this->page['obBuddiesModel'] = User::where('id', (int) $sElementID)->first();
        }
    }
}

buddiespage.htm

title = "BuddiesPage"
url = "/buddies/:slug?"
is_hidden = 0

[BuddiesPage]
slug = ":slug"
==
{% if obBuddiesModel  is not empty %}
    {{ obBuddiesModel.email }}
{% else %}
    {% for obBuddiesModel in arBuddiesList %}
        {{ obBuddiesModel.email }}
    {% endfor %}
{% endif %}