I've created a sort of modified tagging system for the site I'm
working on. Because of the nature of the 'tags' I had to diverge a
little form the standard and my models look like this:
class Word(models.Model):
word = models.CharField(max_length=30)
slug = models.SlugField(prepopulate_from=("word",))
alternate_spelling = models.CharField(max_length=30, blank=True)
pronunciation = models.CharField(max_length=30, blank=True)
pronunciation_example = models.FileField(upload_to="pronunciations",
blank=True)
notes = models.TextField(blank=True)
categories = models.ManyToManyField("FoodWordsCategory", blank=True)
def __unicode__(self):
return self.word
def save(self):
super(Word, self).save()
foodwords.scan_for_word(self)
class Admin:
ordering = ('word',)
search_fields = ['word', 'alternate_spelling',]
class WordedItem(models.Model):
word = models.ForeignKey(Word)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type',
'object_id')
def __unicode__(self):
return self.word
This seems like it should be all well and good, and for the most part
it is. But I'm running into some strange issues that appear to be
related to the fact that WordedItem.word is a ForeignKey. For example:
>>> relations = word.wordeditem_set.all()
>>> relations
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/bostonchefs/lib/python2.5/django/db/models/query.py",
line 108, in __repr__
return repr(self._get_data())
File "/home/bostonchefs/lib/python2.5/django/db/models/base.py",
line 125, in __repr__
return smart_str(u'<%s: %s>' % (self.__class__.__name__,
unicode(self)))
TypeError: coercing to Unicode: need string or buffer, Word found
>>>
Obviously the problem here is that a Word object is being returned
instead of a unicode string, and I can fix that by simple chaging the
def __unicode__(self) to return a simple string (return "string" is
fine for now). However even when I do that I'm still encountering what
appears to be the same problem elsewhere. If I create a Word object,
thanks to the custom save() method I wrote it automatically associates
itself with the appropriate objects (it does a search on the
appropriate database fields, &c). So essentially any time you create a
Word object you can be sure it's going to be associated with some
WordedItem objects. The problem comes in if you then try and delete
that Word object from the admin interface. When I do so, I get
basically the same error as above:
TypeError at /admin/words/word/278/delete/
coercing to Unicode: need string or buffer, Word found
This happens even after I change __unicode__(self) to return "string".
But, if I try and delete the Word object from the command line it
successfully deletes both the Word and the related WordedItems. Does
anyone have any idea what might be going on here?
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