FieldError on django admin fieldsets

Question

私は数ヶ月後にDjangoを試していますが、私は奇妙な動作に直面しています。管理モデルクラスは機能しません。しかし、フィールド名は良好で、コードは正しくフィールドセット変数なしで正しく動作します。ここで

はモデルクラスです：

ModelAdminの

class Lunch_menu(models.Model): 
    lunch_date = models.DateField(auto_now=True) 

    midday_entrance = models.CharField(max_length=256) 
    midday_dish = models.CharField(max_length=256) 
    midday_dessert = models.CharField(max_length=256) 

    dinner_entrance = models.CharField(max_length=256) 
    dinner_dish = models.CharField(max_length=256) 
    dinner_dessert = models.CharField(max_length=256) 

：

from django.contrib import admin 
from self_menu.models import Lunch_menu 

class LunchAdmin(admin.ModelAdmin): 
    list_display = ('lunch_date', 'midday_dish', 'dinner_dish') 
    fieldsets = (
     (None, { 
      'fields': ('lunch_date',) 
     }), 
     ('Lunch', { 
      'classes': ('collapse'), 
      'fields': ('midday_entrance', 'midday_dish', 'midday_dessert'), 
     }), 
    ) 

admin.site.register(Lunch_menu, LunchAdmin) 

そして最後にエラーコード：あなたはauto_now=Truelunch_dateのためのthatsを設定

Internal Server Error: /admin/self_menu/lunch_menu/2/change/ 
Traceback (most recent call last): 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/options.py", line 639, in get_form 
    return modelform_factory(self.model, **defaults) 
    File "/usr/lib/python3.5/site-packages/django/forms/models.py", line 545, in modelform_factory 
    return type(form)(class_name, (form,), form_class_attrs) 
    File "/usr/lib/python3.5/site-packages/django/forms/models.py", line 257, in __new__ 
    raise FieldError(message) 
django.core.exceptions.FieldError: Unknown field(s) (lunch_date) specified for Lunch_menu 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "/usr/lib/python3.5/site-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/usr/lib/python3.5/site-packages/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/options.py", line 541, in wrapper 
    return self.admin_site.admin_view(view)(*args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/utils/decorators.py", line 149, in _wrapped_view 
    response = view_func(request, *args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func 
    response = view_func(request, *args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/sites.py", line 244, in inner 
    return view(request, *args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/options.py", line 1440, in change_view 
    return self.changeform_view(request, object_id, form_url, extra_context) 
    File "/usr/lib/python3.5/site-packages/django/utils/decorators.py", line 67, in _wrapper 
    return bound_func(*args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/utils/decorators.py", line 149, in _wrapped_view 
    response = view_func(request, *args, **kwargs) 
    File "/usr/lib/python3.5/site-packages/django/utils/decorators.py", line 63, in bound_func 
    return func.__get__(self, type(self))(*args2, **kwargs2) 
    File "/usr/lib/python3.5/contextlib.py", line 30, in inner 
    return func(*args, **kwds) 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/options.py", line 1367, in changeform_view 
    ModelForm = self.get_form(request, obj) 
    File "/usr/lib/python3.5/site-packages/django/contrib/admin/options.py", line 642, in get_form 
    % (e, self.__class__.__name__)) 
django.core.exceptions.FieldError: Unknown field(s) (lunch_date) specified for Lunch_menu. Check fields/fieldsets/exclude attributes of class LunchAdmin. 

Answer 1

は、なぜそれが原因エラー。 lunch_dateを読み取り専用にするまたは削除するauto_now設定