sakura/app/News/Category.php

<?php
/**
 * Holds the news category object.
 * @package Sakura
 */

namespace Sakura\News;

use Carbon\Carbon;
use Sakura\DB;
use stdClass;

/**
 * News category object.
 * @package Sakura
 * @author Julian van de Groep <me@flash.moe>
 */
class Category
{
    /**
     * Id of this category.
     * @var int
     */
    public $id = 0;

    /**
     * Name of this category.
     * @var string
     */
    public $name = "";

    /**
     * Description of this news category.
     * @var string
     */
    public $description = null;

    /**
     * Whether this category should be hidden.
     * @var bool
     */
    public $hidden = false;

    /**
     * Holds instances of Post.
     * @var array
     */
    private $postsCache = [];

    /**
     * @param int $id
     */
    public function __construct(int $id = 0)
    {
        if ($id !== 0) {
            $data = DB::table('news_categories')
                ->where('category_id', $id)
                ->first();

            if ($data) {
                $this->id = intval($data->category_id);
                $this->name = $data->category_name;
                $this->description = $data->category_description;
                $this->hidden = boolval($data->category_hidden);
            }
        }
    }

    /**
     * Gets the news posts in this category.
     * @param int $limit
     * @param bool $excludeFuture
     * @param bool $excludeDeleted
     * @return array
     */
    public function posts(int $limit = 0, bool $excludeDeleted = true): array
    {
        if (!$this->postsCache) {
            $posts = DB::table('news_posts')
                ->orderBy('created_at', 'desc');

            if ($this->id !== 0) {
                $posts->where('category_id', $this->id);
            }

            if ($excludeDeleted) {
                $posts->whereNull('deleted_at');
            }

            if ($limit) {
                $posts->limit($limit);
            }

            $this->postsCache = array_map(function (stdClass $post) {
                return new Post($post->post_id);
            }, $posts->get(['post_id']));
        }

        return $this->postsCache;
    }
}