django-treebeard: one tree per user?

Is it possible to have a tree for each user? I was trying something like this

# ----- models.py ------ #
from django.db import Models
from django.contrib.auth.models import User
from treebeard.mp_tree import MP_Node

class MyTree(MP_Node):
user = models.ForeignKey(User)
desc = models.CharField(max_length=255)

def __unicode__(self):
return self.desc

class Meta:
unique_together = [('path', 'user')]

# ----- admin.py ----- #
from django.contrib import admin
from myProject.myApp.models import MyTree
from treebeard.admin import TreeAdmin

class MyTreeAdmin(TreeAdmin):
list_filter = (
'user',
)

admin,site.register(MyTree, MyTreeAdmin)

# ----- end of admin.py ------ #

But the path gets kind of messed up and I get IntegrityErrors.
Also in the admin interface filtering by user is ignored by the tree interface.

What am I doing wrong here?

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