BTW this is the save method for the model with the rounding function:
def save(self):
def roundminute(d, r):
"""Rounds the datetime d to the nearer r multiple
If r == 15 =>
3:00 -> 3:00
3:05 -> 3:00
3:27 -> 3:30
3:55 -> 4:00
Adds hours correctly
"""
from datetime import datetime, timedelta
m = d.minute
if m > (60 - r/2):
m = 0
d += timedelta(60*60)
else:
m = m - (m%r) if (m%r)<(r/2) else m+(r-(m%r))
return d.replace(minute=m, second=0, microsecond=0)
if self.price == None:
self.price = self.start_price
self.start_date = roundminute(self.start_date, 15)
self.end_date = roundminute(self.end_date, 15)
super(Auction, self).save()
On Mon, Oct 27, 2008 at 1:06 PM, Matías Costa <[EMAIL PROTECTED]> wrote:
> I have the exact problem. I round end and start dates to 15 minutes. I
> mean, user enters 12:10, I write 12:15. So each 15 minutes cron runs a
> script with django-commands-extensions runscript. Is a balance between
> accuracy and load.
>
> The perfect should be finding the next success to happen (easy) and program
> django-cron or anything else to run at that time (I don't know how)
>
> I am very interested in the solutions people have found for this
>
>
> On Mon, Oct 27, 2008 at 12:45 PM, redmonkey <[EMAIL PROTECTED]
> > wrote:
>
>>
>> Hi,
>>
>> I'm working on a simple auctioneer's website. My Catalogue app
>> consists of a list of Lots arranged into Catalogues. Each catalogue
>> has an auction_data field which stores a status and a date and time of
>> the sale:
>>
>> class Catalogue(models.Model):
>> DRAFT_STATUS = 1
>> LIVE_STATUS = 2
>> CATALOGUE_CHOICES = (
>> (DRAFT_STATUS, 'Draft'),
>> (LIVE_STATUS, 'Live'),
>> )
>> status = models.IntegerField("Status", choices=CATALOGUE_CHOICES,
>> default=DRAFT_STATUS)
>> auction_date = models.DateTimeField("Date of Auction")
>> ...
>>
>> class Lot(models.Model):
>> catalogue = models.ForeignKey(Catalogue, related_name="lots")
>> ...
>>
>> Pretty simple stuff. My problem is that I need to run a function at
>> the auction_date of the catalogue that will do a few things like
>> change the status of the catalogue, and send an email out to some
>> admins.
>>
>> I've done some brief research, and found <a href="http://
>> code.google.com/p/django-cron/" title="django-cron">django-cron</a>,
>> and I imagine I could write something that checked each hour to see if
>> any catalogues had expried recently, but that seems mad.
>>
>> Another solution I came up with involved checking for the expiry date
>> every time a record is pulled up from the database. But this add's a
>> hit to user responsiveness (even if it is tiny) and still doesn't
>> allow me to send out the email.
>>
>> Finally, I read up on Django's signals to decide if I could use that
>> mechanism to do other things. Signals sounds ideal, but I don't know
>> how to trigger at the right time.
>>
>> Can anyone help me with this? How do I trigger a custom signal based
>> on a DateTimeField value?
>>
>> Thanks,
>> >>
>>
>
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