Charcoal : How to cache object data from a `CollectionLoader` into a `ModelLoader` cache namespace.

charcoal-collection-loader-model-caching.php

<?php

use Pimple\Container;
use Charcoal\Model\ModelInterface;
use Charcoal\Model\CollectionInterface;
use App\Post;

$container = new Container();

$container['cache'] = function (Container $container) {
    // ...
};

$container['model/collection/loader'] = function (Container $container) {
    // ...
};

/**
 * Store an object in the main cache pool.
 *
 * @var Closure {
 *     @param   ModelInterface $obj
 *     @borrows Container      $container
 *     @return  void
 * }
 */
$cacheObjModelFunc = function (ModelInterface $obj) use ($container) {
    $objId = $obj->id();
    if ($objId) {
        $cache = $container['cache'];
    
        $objData = $obj->data();
        $objType = $obj->objType();
        $objKey  = $obj->key();
    
        /** @see ModelLoader::cacheKey() */
        $cacheKey  = 'objects/'.str_replace('/', '.', $objType.'.'.$objKey.'.'.$objId);
        $cacheItem = $cache->getItem($cacheKey);
    
        $cache->save($cacheItem->set($objData));
    }
};
    
/**
 * Collect all active Posts.
 *
 * @param   Container $container The service locator.
 * @borrows Closure   $cacheObjModelFunc
 * @return  Post[]|CollectionInterface
 */
$container['posts'] = function (Container $container) use ($cacheObjModelFunc) {
    $loader  = $container['model/collection/loader'];
    $loader->setModel(Post::class)
           ->addOrder('publish_date', 'desc')
           ->addFilter('active', true)
           ->setCallback($cacheObjModelFunc);
    
    return $loader->load();
};