On Jul 1, 3:31 pm, Doug Warren <doug.war...@gmail.com> wrote: > Let's say I have some models that look like: > > class Emotion(models.Model): > mood = CharField(unique=True) > > class Person(models.Model): > emotions = ManyToManyField(Emotion) > name = CharField() > > angry = Emotion(mood='angry') > angry.save() > sad = Emotion(mood='sad') > sad.save() > bob = Person(name='Bob') > bob.emotions.add(angry) > > From code I'd like to check if a person has a specific emotion, but if > that motion hasn't been defined before (IE: the specified mood does > not exist in the emotion table) I'd like to raise an exception. So > what I'm looking for is giving the above, a way to check that bob is > 'angry', bob is not 'sad', and there is no such thing as 'happy'
bob.emotions.filter(mood='angry').count() # 1 bob.emotions.filter(mood='sad').count() # 0 Emotion.objects.get(mood='happy') # raises Emotion.DoesNotExist -- DR. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
