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I think you are looking for a Generic Relationship:
class Property(models.Model):
user=models.ForeignKey(User)
base=models.ForeignKey(Base)
content_type = models.ForeignKey(ContentType) # Which model is `item` representing?
object_id = models.PositiveIntegerField() # What is its primary key?
item=generic.GenericForeignKey('content_type', 'object_id') # Easy way to access it.
amount=models.IntegerField(default=0)
level=models.SmallIntegerField(default=0)
This lets you create items as you mentioned, however you would probably need to look at a different way of filtering those items out.
๐คJack M.
Source:stackexchange.com