如何对对象数组laravel进行分页？

when i try to paginate results passed from the logged in user I get the error:

$message = Auth::user()->Notifications()->orderBy('created_at', 'desc')->get()
        ->groupBy(function($date) {
            return Carbon::parse($date->created_at)->format('M d'); // grouping by day
        })
        ->paginate(2);

Call to undefined method Illuminate\Database\Eloquent\Collection::paginate()

what is the problem and how can I paginate my object array?

Try this:

$message = Auth::user()->Notifications()->orderBy('created_at', 'desc')
    ->groupBy(function($date) {
        return Carbon::parse($date->created_at)->format('M d'); // grouping by day
    })->paginate(2);

the paginate method needs to be the last element in the chain like->get()

// edit: As stated here: http://laravel.com/docs/4.2/pagination

Note: Currently, pagination operations that use a groupBy statement cannot be executed efficiently by Laravel. If you need to use a groupBy with a paginated result set, it is recommended that you query the database manually and use Paginator::make.

This could also be helpful: http://www.jenssegers.be/blog/57/laravel-pagination-with-grouping-and-eager-loading

Of course you get the error as groupBy returns an instance of Illuminate\Support\Collection. You would need to do something like

$messages = Auth::user()->Notifications()->orderBy('created_at', 'desc')->paginate(2);

$messages->setItems($messages->groupBy(function($date) {
            return $date->created_at->format('M d'); // grouping by day
        }));

This way you set up new items in your pagination object which are grouped results from database.