Performing a Groupwise Maximum in Laravel 4

问题

What's the best way to perform a groupwise maximum using Laravel's Eloquent ORM such that it returns instances of models?

回答1:

Based on this stackoverflow answer, I was able to create the following:

    $query = MyModel
        ::from(DB::raw(
            'my_models NATURAL JOIN (
                SELECT   user_id, MAX(created_at) created_at
                FROM     my_models
                GROUP BY user_id
            ) t'
        ))
    ;

来源：https://stackoverflow.com/questions/17043309/performing-a-groupwise-maximum-in-laravel-4