> I'm sorry, but the problem with it is that it isn't symmetrical.
>
> A part of my Profile-model looks like this:
> class Profile(models.Model):
> user = models.ForeignKey(User)
> friends = models.ManyToManyField("self")
>
> This makes it very easy to create and maintain a relationship
> between users - but I have no idea how to specify the friendship
> type. Is it even possible?
Yes, it's possible...The models I provided do precisely that. A
M2M relationship uses/creates/maintains a table that Django keeps
rather well hidden from you unless you go looking for it or
poking in dark SQL corners. In your case, it's likely a table
called "app_profile_profile" or "app_profile_friends" or
something of the like. It consists of merely two columns: two
foreign keys just as my Friendship model did. What you describe
is wanting to add a column to this table. This is done by
promoting it to a full model.
If you need the syntactic sugar, you can use the related_name
parameter:
class Friendship(Model):
person = Person(related_name="friends")
friend = Person(related_name="thinks_i_am_a_friend")
description = ForeignKey(FriendshipType)
known_since = DateTimeField()
This allows you to iterate through
p = Person.objects.get(id=1)
friends = p.friends
rather than iterating through
friends = p.friendship_set
which you can then use as
for f in friends:
print f.friend, ' is my ', f.description
You can also find out who thinks a person is a friend:
friend_of = p.thinks_i_am_a_friend
for f in friend_of:
print "I am %s's %s whether or not they are my friend" % (
f.person, f.description)
This also meets your criterion that, X can consider Y a friend,
but Y doesn't have to consider X a friend. Which does reflect
the real world. Imagine if "description" was "Mom". If X is Y's
mom, but Y certainly wouldn't be X's mom. Unless you live in
some freaky world of inbreeding where you married your own father. :)
-tim
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