類型錯誤「X」對象有「__getitem__」

Question

即時得到錯誤

'CampSite' object has no attribute '__getitem__' 

當我保存在管理界面新CampCon進入無屬性。我有一個叫做露營地的應用程序來處理露營地的數據庫，並且我有另一個名爲內容的應用程序來處理評論。我對Django非常陌生，這是我第一個非基於教程的項目。我一直在絞盡腦汁，在網上尋找一個沒有運氣的答案。預先感謝您的幫助。 這裏是我的營地模式：

from django.contrib.gis.db import models 

class CampSite(models.Model): 
    name = models.CharField(max_length=250) 
    showers = models.BooleanField() 
    flush = models.BooleanField() 
    rv = models.BooleanField() 
    lonlat = models.PointField(null=True, blank=True) 

    objects = models.GeoManager() 

    def __unicode__(self): 
     return self.name 

以下是內容模型：

from django.contrib.gis.db import models 
from campsites.models import CampSite 
from django.contrib.auth.models import User 
from activities.models import Activities 


class CampCon(models.Model): 
    campsite = models.ForeignKey(CampSite) 
    trip = models.ForeignKey('Trip') 
    Date = models.DateField() 
    user = models.ForeignKey(User) 
    overall_review = models.TextField() 
    facilities_review = models.IntegerField() 
    things_to_do = models.IntegerField() 
    privacy = models.IntegerField() 
    beauty = models.IntegerField() 
    overall_rating = models.IntegerField() 

    def __unicode__(self): 
     return self.campsite 

class ImageDB(models.Model): 
    campsite = models.ForeignKey(CampSite) 
    user = models.ForeignKey(User) 
    description = models.CharField(max_length=200) 
    image = models.ImageField(upload_to='/home/bobby/Pictures/CampThat') 
    date_uploaded = models.DateField() 
    date_taken = models.DateField() 
    trip = models.ForeignKey('Trip') 
    activity = models.ForeignKey(Activities) 

    def __unicode__(self): 
     return self.campsite 

class Trip(models.Model): 
    date = models.DateField() 
    description = models.CharField(max_length=100) 
    title = models.CharField(max_length=100) 
    blog = models.TextField() 

    def __unicode__(self): 
     return self.title 

class ActivityCon(models.Model): 
    trip = models.ForeignKey(Trip) 
    rating = models.IntegerField() 
    overall_review = models.TextField() 
    activity = models.ForeignKey(Activities) 

這裏是完全回溯：

Environment: 


Request Method: POST 
Request URL: http://localhost:8000/admin/content/campcon/add/ 

Django Version: 1.5 
Python Version: 2.7.3 
Installed Applications: 
('django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.sites', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'campsites', 
'auth', 
'trips', 
'content', 
'activities', 
'django.contrib.admin') 
Installed Middleware: 
('django.middleware.common.CommonMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware') 


Traceback: 
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 
    116.       response = callback(request, *callback_args, **callback_kwargs) 
File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper 
    367.     return self.admin_site.admin_view(view)(*args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view 
    91.      response = view_func(request, *args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 
    89.   response = view_func(request, *args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner 
    202.    return view(request, *args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper 
    25.    return bound_func(*args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view 
    91.      response = view_func(request, *args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func 
    21.     return func(self, *args2, **kwargs2) 
File "/usr/lib/python2.7/site-packages/django/db/transaction.py" in inner 
    208.     return func(*args, **kwargs) 
File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py" in add_view 
    958.     self.log_addition(request, new_object) 
File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py" in log_addition 
    525.    action_flag  = ADDITION 
File "/usr/lib/python2.7/site-packages/django/contrib/admin/models.py" in log_action 
    18.   e = self.model(None, None, user_id, content_type_id, smart_text(object_id), object_repr[:200], action_flag, change_message) 

Exception Type: TypeError at /admin/content/campcon/add/ 
Exception Value: 'CampSite' object has no attribute '__getitem__' 

Answer 1

您的問題是，你的__unicode__函數返回模型對象，當他們需要返回Unicode字符串。

您可以通過添加unicode()功能，以您的__unicode__方法實現這一目標：

class CampCon(models.Model): 
    campsite = models.ForeignKey(CampSite) 
    trip = models.ForeignKey('Trip') 
    Date = models.DateField() 
    user = models.ForeignKey(User) 
    overall_review = models.TextField() 
    facilities_review = models.IntegerField() 
    things_to_do = models.IntegerField() 
    privacy = models.IntegerField() 
    beauty = models.IntegerField() 
    overall_rating = models.IntegerField() 

    def __unicode__(self): 
     return unicode(self.campsite) 

class ImageDB(models.Model): 
    campsite = models.ForeignKey(CampSite) 
    user = models.ForeignKey(User) 
    description = models.CharField(max_length=200) 
    image = models.ImageField(upload_to='/home/bobby/Pictures/CampThat') 
    date_uploaded = models.DateField() 
    date_taken = models.DateField() 
    trip = models.ForeignKey('Trip') 
    activity = models.ForeignKey(Activities) 

    def __unicode__(self): 
     return unicode(self.campsite) 

這將調用CampSite.__unicode__將返回campsite.name。

Answer 2

使用此方法代替：

def __unicode__(self): 
     return unicode(self.campsite) 

Answer 3

，如果你不喜歡這樣也會發生這種情況：

event_name = CharField(max_length = 250) 

，而不是像這樣：（正道）

event_name = models.CharField(max_length = 250) 

可能對某人有用

Answer 4

由於這是在谷歌的第一擊：

class ItemGroup(models.Model): 
    groupname = models.CharField(max_length=128) 

    def __unicode__(self): 
     return "%s" % self.groupname 

class Item(models.Model): 
    name = models.CharField(max_length=128) 
    group = models.ForeignKey(MedGroup, verbose_name="Groep") 

    def __unicode__(self): 
     return "%s (%s)" % (self.name, self.group[:10]) 

最後一行是錯誤的：執行以下操作時，我得到一個類似的錯誤（'ItemGroup' object has no attribute '__getitem__'）。

通過將該行更換爲return "%s (%s)" % (self.name, self.group.groupname[:10])