小编Jos*_*hua的帖子

我有一个可以附加到其他模型的模型.

class Attachable(models.Model):
    content_type = models.ForeignKey(ContentType)
    object_pk = models.TextField()
    content_object = generic.GenericForeignKey(ct_field="content_type", fk_field="object_pk")

    class Meta:
        abstract = True

class Flag(Attachable):
    user = models.ForeignKey(User)
    flag = models.SlugField()
    timestamp = models.DateTimeField()

我正在另一个模型中创建与此模型的通用关系.

flags = generic.GenericRelation(Flag)

我尝试从这种通用关系中获取对象,如下所示:

self.flags.all()

这导致以下异常:

>>> obj.flags.all()        
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/manager.py", line 105, in all
    return self.get_query_set()                                                              
  File "/usr/local/lib/python2.6/dist-packages/django/contrib/contenttypes/generic.py", line 252, in get_query_set
    return superclass.get_query_set(self).filter(**query)                                                         
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 498, in filter                    
    return self._filter_or_exclude(False, *args, **kwargs)                                                        
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 516, in …

我很确定我已经包含了qanda类,但是当我尝试声明包含它的向量或类型的类时,我得到一个错误,说qanda未定义.知道问题可能是什么？

bot_manager_item.h

#pragma once

#include "../bot_packet/bot_packet.h"
#include <vector>

class bot_manager_item;
#include "qanda.h"
#include "bot_manager.h"

class bot_manager_item
{
public:
    bot_manager_item(bot_manager* mngr, const char* name, const char* work_dir);
    ~bot_manager_item();

    bool startup();
    void cleanup();
    void on_push_event(bot_exchange_format f);
    bool disable;

private:
    void apply_changes();
    bot_manager *_mngr;

    std::string _name;
    std::string _work_dir;
    std::string _message;
    std::string _message_copy;
    std::vector<qanda> games;
    qanda test;

    char _config_full_path[2600];
};

qanda.h

#ifndef Q_AND_A
#define Q_AND_A

#include "users.h"
#include "..\bot_packet\bot_packet.h"
#include "bot_manager.h"
#include <string>
#include <algorithm>
#include <map>
#include <vector>
#include <fstream>


class qanda
{ …

所以我现在正在玩弄我的脑子.我觉得我在python中发现了一个bug,但我确信不可能是这样.有人能说出我错过的东西吗？

class LinkedList():
    def __init__(self):
        pass


def SortedLinkedList(LinkedList):
    pass

new_list = SortedLinkedList()

给

TypeError: SortedLinkedList() takes exactly 1 argument (0 given)

而

new_list = SortedLinkedList("wtf")

工作良好.到底是怎么回事？