On Mon, Jan 18, 2010 at 2:59 PM, Alex Robbins
<alexander.j.robb...@gmail.com> wrote:
> Hmm, you posted the save method for your Event model, but not the
> definition. I think you haven't gotten any feed back because no one
> really knows what you are asking. Could you show the Event model, and
> then show what a finished save should look like? What should the data
> end up like?
Thanks for the reply Alex, I hadn't posted the model definition
because there's a lot of irrelevant stuff, but point taken, here's
most of it:
class Event(models.Model):
name = models.CharField("Listings title", max_length=100)
disciplines = models.CharField(max_length=250)
classes_involved = models.ManyToManyField("categories.Class",
blank=True, null=True)
start_date = models.DateField("First day of the event")
end_date = models.DateField("Last day of the event")
approved = models.BooleanField()
# some removed.
def __unicode__(self):
return self.name
It's fairly simple, the complex bit is filling in the disciplines. I
tried to add something to the save() to fill it in.
In the Admin area, the event form shows the classes_involved (a choice
of about 20), but doesn't show the disciplines.
I was hoping to fill in the disciplines from the classes_involved.
It's just used in listings, not for comparison, so a text string is
fine.
There are two problems:
1. The performance hit by going through 2 levels of manytomany fields.
The first to get all classes_involved and then for each of those, to
get it's parent. (I assume this is bad, my laptop seems to think so.)
2. When I edit an event, the save() doesn't seem to work from the
form-data, it works on the previously saved data. I.e. if edit the
classes_involved once and save, the discipline is not adjusted. If I
save it twice, the discipline is adjusted.
I was aiming for a cheap way to do two-level categorisation, however,
I'm now thinking I just keep the categories separate and make admin
users fill in the discipline manually.
Kind regards,
-Alastair
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