On Thu, 2006-06-22 at 04:30 -0700, Spock wrote:
> I'm getting some errors when trying call latest() method on quety set
> when there is no associated data in table. Here is example:
> Model(reduced):
>
> class Ticket(Model):
> title = CharField('Tytul',maxlength=128)
> priority = SmallIntegerField('Priorytet',choices=PRIORITIES)
> author = ForeignKey(User)
> class Comment(Model):
> created_at = DateTimeField(auto_now_add=True,editable=False)
> creator = ForeignKey(User)
> ticket = ForeignKey(Ticket)
> body = TextField()
>
> -------------
> In [35]: t
> Out[35]: <Ticket: Testy informowania o nowych wpisach>
>
> In [36]: t.comment_set.latest('created_at')
[...]
>
> DoesNotExist: Comment matching query does not exist.
>
> In [37]:
>
>
> After adding some comment:
>
> In [40]: t.comment_set.latest('created_at')
> Out[40]: <Comment: One comment>
>
> In [41]:
>
> There is result :-)
>
> Is this normal thing ?
This is expected behaviour. The first query asks for the latest comment
for that ticket and there are no comments. It is common in Django to
raise a DoesNotExist exception when a method that should return
something has an empty result set.
The second query returns the latest (in fact, only) comment.
Regards,
Malcolm
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