I created a through model so I can add an order field to the m2m field but I am having problems auto incrementing the order field via def number() below. When I add an object, I get TypeError unsupported operand type(s) for +: 'dict' and 'int' and i'm not sure why. Any ideas?
models.py:
class Playlist(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1)
name = models.CharField(max_length=50)
tracks = models.ManyToManyField(Track, through='PlaylistTrack')
def __str__(self):
return self.name
class PlaylistTrack(models.Model):
def number():
last_order = PlaylistTrack.objects.all().aggregate(Max('order'))
if last_order == None:
return 1
else:
return last_order + 1
track = models.ForeignKey(Track)
playlist = models.ForeignKey(Playlist)
order = models.PositiveIntegerField(default=number)
class Meta:
ordering = ['order']
As mentioned in the docs, aggregate() returns a dict object. Hence, the variable last_order is actually a dict and you are trying to add a number to a dict.
You should get the value from the dict and then add.
return last_order['order__max'] + 1
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