将Django从1.6更新到1.8：在select_related中给出了无效的字段名

我把项目从Django 1.6.7更新到了1.8.7，但在Django 1.8中我遇到了以下异常，尽管在Django 1.6中这段代码是正确的：

In[2]: from apps.route import models
In[3]: models.Trace.objects.select_related("trace_points")
Out[3]: <repr() failed: django.core.exceptions.FieldError: Invalid field name(s) given in select_related: 'trace_points'. Choices are: user>

我的模型：

class Trace(SocialMixin, models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='traces')
    name = models.CharField(u'Название', max_length=255)
    rating = RatingField(range=5, weight=0)
    start_date = models.DateTimeField(u'Дата старта')
    finish_date = models.DateTimeField(u'Дата окончания', null=True, blank=True)
    distance = models.DecimalField(max_digits=15, decimal_places=6, null=True, blank=True)
    created = models.DateTimeField(auto_now_add=True)
    hits = generic.GenericRelation(HitCount, object_id_field='object_pk')
    description = models.TextField(null=True, blank=True)
class TracePoint(models.Model):
    country = models.ForeignKey(Country, null=True, blank=True)
    city = models.ForeignKey(City, null=True, blank=True)
    trace = models.ForeignKey(Trace, related_name="trace_points")

我也在DetailView中遇到了这个错误，DetailView使用了get_related_selections，当然我得到了\"FieldError: Invalid field name...\"，为了避免这个错误，我得使用ManyToManyField代替ForeigenKey？