'PollAdmin.fields'是指字段'无'，从表格中缺少

Question

我试图用Django做一个民意调查，但我很新，当我去管理的事情，它给这个错误：

ImproperlyConfigured at /admin/polls/poll/1/ 
'PollAdmin.fields' refers to field 'None' that is missing from the form. 

我不是很确定那是什么意思，但是这是我的admin.py文件，我认为这是导致错误：

from django.contrib import admin 
from polls.models import Poll 

class PollAdmin(admin.ModelAdmin): 
    fields = [ 
    (None,   {'fields': ['question']}), 
    ('Date information', {'fields': ['pub date']}), 

admin.site.register(Poll, PollAdmin) 

编辑：

这里是我的楷模文件，如果该事项：

from django.db import models 
import datetime 
from django.utils import timezone 

class Poll(models.Model): 
    question = models.CharField(max_length = 200) 
    pub_date = models.DateTimeField('date published') 
    def __unicode__(self): 
    return self.question 
    def was_published_recently(self): 
    return self.pub_date >= timezone.now() - datetime.timedelta(days = 1) 

class Choice(models.Model): 
    poll = models.ForeignKey(Poll) 
    choice_text = models.CharField(max_length = 200) 
    votes = models.IntegerField() 
    def __unicode__(self): 
    return self.choice_text 

编辑（再）

现在我固定我PollAdmin类这样的：

class PollAdmin(admin.ModelAdmin): 
    fieldsets = [ 
    (None,   {'fields': ['question']}), 
    ('Date information', {'fields': ['pub_date']}), 
    ] 

但它在说：

DoesNotExist at /admin/polls/poll/1/ 
Site matching query does not exist. 

Answer 1

使用fieldsets而不是字段：

class PollAdmin(admin.ModelAdmin): 
    fieldsets = [ 
    (None,   {'fields': ['question']}), 
    ('Date information', {'fields': ['pub_date']}),