models.py:
class Like(models.Model):
event = models.ForeignKey(Event)
user = model.ForeignKey(User)
class Meta:
unique_together = ("event", "user")
Now you can count Likes for a given event
likes =
Like.objects.filter(event='BizBangBoom').annotate(number_of_entries=Count('entry'))
The unique_together Meta enforces limit of one like per user, per event.
If a user un-likes an event, delete the envent - user record
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