问django中有可以有多个外键字段的字段吗？

EN

from django.db import models
from django.auth.models import *
class Wish(Model):
    name = CharField(max_length=128)
    cost = IntegerField()
    person = ForeignKey(Person)
    date = DateField('Date Wished')
    comments = CharField(max_length=1024)
    def __unicode__(self):
        return name

class Person(Model):
    user = ForeignKey(User)
    friends =...  # multiple foriegn keys of itself