问Django admin没有列出模型对象，但计数显示

EN

class Professeurs(Metadata):
    nom = models.CharField(max_length=255)
    prenom = models.CharField(max_length=255)
    biographie = models.TextField()
    #photo = models.ForeignKey(image_model,blank=True)
    photo = models.OneToOneField(Photo,primary_key=True,blank=True)


    def __unicode__(self):
        return "%s  %s" % (self.nom, self.prenom)

class general(admin.ModelAdmin):
   class Media:
     js = ('/static/js/tiny_mce/tiny_mce.js', '/static/js/tiny_mce/textareas.js',)

class ProfesseursAdmin(general):
    list_display = ('prenom' , 'nom' )
    fields = ['prenom','nom', 'biographie','photo']

admin.site.register(Professeurs, ProfesseursAdmin)