On Thu, 2009-04-30 at 12:42 -0700, Bro wrote:
> class SentenceText(models.Model):
> language = models.ForeignKey(Language)
> text_id = models.IntegerField()
> text = models.TextField()
> def __unicode__(self):
> return self.id + ' ' + self.text
>
> class Box(models.Model):
> label = models.ForeignKey(SentenceText, to_field='text_id',
> related_name='%(class)s_related_label')
> description = models.ForeignKey(SentenceText, to_field='text_id',
> related_name='%(class)s_related_description')
> def __unicode__(self):
> return self.label
>
> ============================
>
> I've got a strange error and in many hour, I haven't manage to fix it.
>
> In the Box class, I have 2 ForeignKey to SentenceText because I want
> for example the same label (or description) in french or in english.
>
> But when I try to show a Box list (in admin panel) or a Box detail,
> I've got this error :
>
> "Caught an exception while rendering: coercing to Unicode: need string
> or buffer, SentenceText found"
A __unicode__ method *must* return a unicode string. You're returning
self.label which is a SentenceText object -- as the exception notes.
It's certainly no doubt possible to convert a SentenceText into a string
by some means, but Python will not do that for you as part of the
__unicode__ (or __str__) method return process. You must make sure you
are converting to a string.
The simplest and normally completely correct solution here is to write
def __unicode__(self):
return unicode(self.label)
Regards,
Malcolm
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