Question

我正在尝试在创建游戏时为游戏动态创建表格。此表将包含有关玩游戏的用户的详细信息。我不知道如何创建动态模型，因此遵循本教程：https://code.djangoproject.com/wiki/DynamicModels。它可能很旧，因为我的Django版本是1.7.1，我不确定。

我的相关代码示例如下：

    def addgame(request):

...
name = request.POST.get('name','')
                #declare the field types in the table
                fields = { 'player' : models.ForeignKey(User),'registration_date' : models.DateField(auto_now=False,auto_now_add=False),
                        'highest_score' : models.PositiveIntegerField(null=True,blank=True), 'most_recent_score' : models.PositiveIntegerField(null=True,blank=True)
                    }
                #call create_gamemodel view to create the table for the game being added.
                model = create_gamemodel(name,fields)   

    ...


def create_gamemodel(name, fields=None, module=''):

    class Meta:
        # Using type('Meta', ...) gives a dictproxy error during model creation
        pass

    # Set up a dictionary to simulate declarations within a class
    attrs = {'__module__': module, 'Meta': Meta}

    # Add in any fields that were provided
    if fields:
        attrs.update(fields)

    # Create the class, which automatically triggers ModelBase processing
    model = type(name, (models.Model,), attrs)

    return model

错误跟踪如下：

Traceback:
File "/home/mukhera3/djangoenv/lib/python3.2/site-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/mukhera3/Desktop/game_store/wsdProject/gamestore/views.py" in addgame
  146.          model = create_gamemodel(name,fields)   
File "/home/mukhera3/Desktop/game_store/wsdProject/gamestore/views.py" in create_gamemodel
  183.  model = type(name, (models.Model,), attrs)
File "/home/mukhera3/djangoenv/lib/python3.2/site-packages/django/db/models/base.py" in __new__
  109.                 model_module = sys.modules[new_class.__module__]

Exception Type: KeyError at /addgame/
Exception Value: ''

显然这些线路有问题：

model = create_gamemodel(name,fields) (in addgame(request) view)
model = type(name, (models.Model,), attrs) (in create_gamemodel view)

我不太明白问题所在，也不确定这是否是创建动态模型的正确方法。请帮忙！

尝试动态创建模型时Django中的KeyError

0 个答案: