On May 4, 1:15 pm, JonathanB <doulo...@gmail.com> wrote:
> I'm working on a Grade Book program for my personal use. Here is the
> relevant class from my models.py file:
>
> class Grade(models.Model):
> student = models.ForeignKey(Student)
> assignment = models.ForeignKey(Assignment)
> grade = models.DecimalField(max_digits=5, decimal_places=2)
>
> def __unicode__(self):
> return self.grade
>
> I get the following error when I try to enter something using the
> admin interface (all the other models would save without issue): I'm
> trying to put in "10" or "10.0". I want to use a Decimal field to
> allow for 1/2 points (such as if they get the right word but the wrong
> spelling, earning a 9.5). Below is the copy/paste from the Error page
> I get when I click "Save":
<snip>
> Exception Type: TypeError at /admin/grades/grade/add/
> Exception Value: coercing to Unicode: need string or buffer, Decimal
> found
>
> So, what have I missed? Do I need to import Decimal someplace? And if
> so, where? admin.py?
The problem is in your __unicode__ method. As the name implies, it
should always actually return a unicode value, but you're just
returning the value of self.grade, which is decimal. To be safe,
Python doesn't automatically coerce anything that's not a string to
unicode - you have to do it explicitly yourself. So your method should
just be:
def __unicode__(self):
return unicode(self.grade)
--
DR.
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