Generic relationships between existing entities, many2many

Hi,

So, I have the 4 entities represented below which are strong and independent entities on my application, now the problem is that each Article or Picture could be "tagged" with a Presenter or an Event, being as they are the 4 of them independent entities that could become more complex It doesn't look right to add Event and Presenter field to both Article and Picture or the contrary, specially because they could be tagged with none.
In the long run as well other entities might need to be tagged and other taggable entities might appear.

class Article(models.Model):
      #Fields
class Picture(models.Model):
      #Fields
class Presenter(models.Model):
      # Fields
class Event(models.Model):
      # Fields

The closer I am getting is to some kind of double-headed Generic contenttype based intermediate model like this(haven't tested yet as it is a bit more complex than that), but I am looking for ideas:

class GenericTag(models.Model):
      # Event,Presenter instance..
    tagcontent_type = models.ForeignKey(ContentType)
      tagobject_id = models.PositiveIntegerField()
    tagcontent_object = generic.GenericForeignKey('tagcontent_type', 'tagobject_id')
      # Picture,Article instance
    objcontent_type = models.ForeignKey(ContentType)
      objobject_id = models.PositiveIntegerField()
    objcontent_object = generic.GenericForeignKey('objcontent_type', 'objobject_id')
  

And with that just do queries based on the information I have, I think there have to be more elegant ways to do this without stuffing all tagmodels as fields into taggablemodels.

So, basically, there are several "taggable" objects and "tag" objects which will never overlap and I would like a way of relating them with django without touching the models themselves as they are entities of their own apps.

I was looking into a proxy model with a many2many field, but cannot add fields to proxy models.

Thanks

--
Arkaitz

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