class Post extends RecordEntity
{
    use TimestampsTrait;

    //Database partitions, isolation and aliasing
    const DATABASE = 'blog';

    const SCHEMA = [
        'id'     => 'bigPrimary',
        'title'  => 'string(64)',
        'status' => 'enum(published,draft)',
        'body'   => 'text',
        
        //Simple relation definitions
        'comments' => [self::HAS_MANY => Comment::class],
        
        //Not very simple relation definitions
        'collaborators' => [
            self::MANY_TO_MANY  => User::class,
            self::PIVOT_TABLE   => 'post_collaborators_map',
            self::PIVOT_COLUMNS => [
                'time_assigned' => 'datetime',
                'type'          => 'string, nullable',
            ],
            User::INVERSE       => 'collaborated_posts'
        ],
        
        //Pre-compiled relations
        'author'   => [
            self::BELONGS_TO   => AuthorInterface::class,
            self::LATE_BINDING => true
        ],
               
        //Hybrid databases
        'metadata' => [
            Document::ONE => Mongo\Metadata::class
        ]
    ];
}

$posts = $postSource->find()->distinct()
    ->with('comments', ['where' => ['{@}.approved' => true]]) //Automatic joins
    ->with('author')->where('author_name', 'LIKE', $authorName) //Fluent
    ->load('comments.author') //Cascade eager-loading (joins or external query)
    ->paginate(10) //Quick pagination using active request
    ->getIterator();

foreach ($posts as $post) {
    echo $post->author->getName();
}

$post = new Post();
$post->publish_at = 'tomorrow 8am';
$post->author = new User(['name' => 'Antony']);

$post->tags->link(new Tag(['name' => 'tag A']));
$post->tags->link($tags->findOne(['name' => 'tag B']));

$transaction = new Transaction();
$transaction->store($post);
$transaction->run();

//--or--: Active record (optional)
$post->save();

//--or--: request specific transaction
$this->transaction->store($post);