Building WordPress Custom Post Types Before Convention Over Configuration

before-coc.php

<?php

namespace YourProject;

class Book extends BaseModel implements BaseModelInterface
{
    public function __construct($bean = null)
    {
        parent::__construct($bean);
    }
    
    public function getPostType()
    {
        if( !isset(self::$postType) ){
           static::$postType = 'post';
        }
        return static::$postType;
    }
}