a report problem

model:
class Dates(models.Model):
    this_date = models.DateField()

class Booking(models.Model)
    seats = models.IntegerField()
    date = models.ForeignKey(Dates)

report view:
    this_date = "01-01-2000"
    seats = 0
    daily_arrivals = []
    all = Booking.objects.all()
    for a in all:
        while a.date != this_date:
            seats += seats
            daily_seats.append("%s - %s" % (a.date, a.seats)
            this_date = a.date

What I am trying to get at is a total of seats by date as a list to send to a template

Anyone got any better way of doing this cos this sure isn't working too well
   
Cheers

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