Question

我在Django的管理员中使用了EmbeddedModelFields和ListFields。为此，我使用以下教程： https://gist.github.com/jonashaag/1200165 https://gist.github.com/ielshareef/3011156

我的models.py包含以下内容，

class EmbedOverrideField(EmbeddedModelField):
    def formfield(self, **kwargs):
        return models.Field.formfield(self, ObjectListField, **kwargs)

class CategoryField(ListField):
    def formfield(self, **kwargs):
        return models.Field.formfield(self, StringListField, **kwargs)

class Post(models.Model):
    pub_date = models.DateTimeField(auto_now_add=True, null=True) # 
    title = models.CharField(max_length=255)
    post_text = models.TextField()
    tags = CategoryField()
    comments = CategoryField(EmbedOverrideField('Comment'))

    def __str__(self):
        return self.post_text

在admin.py中，我有，

site.register(Post)

在管理网站上，我尝试点击＆＃34;发布＆＃34;看看那里有什么，我得到了上述错误。为什么会这样？

谢谢！

编辑：我不知道这是否有任何帮助，但当我尝试添加新帖子时，我会看到一个表格，我可以在其中输入帖子标题，文字，标签和评论。当我实际保存它时，我收到错误，

Expected instance of type <class 'polls.models.Comment'>, not <type 'unicode'>.

为了清楚起见，我确实使用MongoDB作为我的后端。

以下是完整的异常堆栈跟踪：

File "/Users/Anupa/myproject/lib/python2.7/site-
packages/django/core/handlers/base.py" in get_response
112.                     response = wrapped_callback(request, *callback_args,      **callback_kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-   packages/django/contrib/admin/options.py" in wrapper
  466.                 return self.admin_site.admin_view(view)(*args,    **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
99.                     response = view_func(request, *args, **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
52.         response = view_func(request, *args, **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
198.             return view(request, *args, **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
29.             return bound_func(*args, **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
99.                     response = view_func(request, *args, **kwargs)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
25.                 return func(self, *args2, **kwargs2)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/contrib/admin/options.py" in changelist_view
1445.             'selection_note': _('0 of %(cnt)s selected') % {'cnt':  len(cl.result_list)},
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/db/models/query.py" in __len__
77.         self._fetch_all()
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
857.             self._result_cache = list(self.iterator())
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django/db/models/query.py" in iterator
220.         for row in compiler.results_iter():
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/basecompiler.py" in results_iter
381.             yield self._make_result(entity, fields)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/basecompiler.py" in _make_result
431.                 value = self.ops.value_from_db(value, field)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in value_from_db
254.         return self._value_from_db(value, *self._convert_as(field))
File "/Users/Anupa/myproject/lib/python2.7/site-packages/django_mongodb_engine/base.py" in _value_from_db
154.             value, field, field_kind, db_type)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in _value_from_db
380.                                                    field_kind, db_type)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in _value_from_db_collection
513.                 return list(value)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in <genexpr>
508.                 for subvalue in value) 
File "/Users/Anupa/myproject/lib/python2.7/site-   packages/django_mongodb_engine/base.py" in _value_from_db
154.             value, field, field_kind, db_type)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in _value_from_db
385.                                               field_kind, db_type)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/db/base.py" in _value_from_db_model
587.         embedded_model = field.stored_model(value)
File "/Users/Anupa/myproject/lib/python2.7/site-packages/djangotoolbox/fields.py" in stored_model
299.         module = column_values.pop('_module', None)

Exception Type: AttributeError at /admin/polls/post/
Exception Value: 'unicode' object has no attribute 'pop'

Answer 1

您忘记了评论模型吗？

编辑：

问题是有一个Post实体，注释为字符串而不是Comment实例。

Answer 2

我能够通过调用

重现此错误

from polls.models import Post
Post.objects.get()

我通过切换到一个全新的数据库来修复它。但是，发布评论的错误仍然存在。 :-(任何想法如何修复那个？

Django错误：'unicode'对象没有属性'pop'

2 个答案: