gistfile1.php

    <?php 

    class Entry extends Eloquent
    {
        protected function withPaymentsStatus($status)
        {
            return $this->whereHas('payments', function($query) {
                $query->where('status', $status);
            });
        }

        public function paid()
        {
            return $this->withPaymentsStatus(1);
        }

        public function pending()
        {
            return $this->withPaymentsStatus(2);
        }
    }

    // pra usar no controller
    $entries = Entry::withPaymentsStatus(2)->get();

    // pq não retornar com o ->get() já??? pq vc pode usar outras coisas tipo:
    $entries = Entry::orderBy('created_at', 'DESC')->withPaymentsStatus(3)->get();

public function payments($status)
{
    return $this->hasMany('Payment', 'entry_id')
        ->where('status', $status);
}

public function payments($status = null)
{
    $return =  $this->hasMany('Payment', 'entry_id');

    if ($status !== null) {
        return $return->where('status', $status);
    }

    return $return;
}