Generic one-to-one relation in Django

Question

I need to set up one-to-one relation which must also be generic. May be you can advice me a better design. So far I came up to the following models

class Eve         


        

Answer 1

Use .get() return raise if object doesn't exist, .first() return None if object doesn't exist.

Name events_relation is an elegant way to differentiate event from events.

class Event(models.Model):
    content_type      = models.ForeignKey(ContentType)
    object_id         = models.PositiveIntegerField()
    content_object    = generic.GenericForeignKey('content_type', 'object_id')

    class Meta:
        unique_together   = ('content_type', 'object_id') # Important

class Action1(models.Model):
    events_relation = generic.GenericRelation(Event)

    @property
    def event(self):
        # Return the object in exists
        # else None 
        return self.events_relation.first()