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尝试使用 Django MongoDBForms 替换 ModelForms 但在保存表单实例时出现这个非常奇怪的错误。

在 save() 期间，mongoengine.Document 检查 MongoDBForm 包装的 _meta 字典中的 cascade 关键字。

MongoDBForm 然后从 getitem 抛出一个KeyError

它在寻找什么级联键？！

我做错了吗？

Request Method: POST
Request URL:    http://localhost:8000/add_item/Books
Django Version: 1.4.2
Exception Type: KeyError
Exception Value:    
0
Exception Location: /Users/holografix/.virtualenvs/troca/lib/python2.7/site-packages/mongodbforms/documentoptions.py in __getitem__, line 171
Python Executable:  /Users/holografix/.virtualenvs/troca/bin/python
Python Version: 2.7.3

来自 models.py 的模型

class GenericItem(Document):
    owner_id = IntField(required=True)
    title = StringField(max_length=70, required=True)
    description = StringField(max_length=140, required=True)
    value = IntField()
    location = GeoPointField()
    offers = ListField(EmbeddedDocumentField('Offer'))

    def __unicode__(self):
        return self.title

    class Meta:
        abstract = False
        app_label = 'troca_app'
        db_table = 'generic_item'
        allow_inheritance = True

等效于 forms.py 的 ModelForm

class ModelFormGenericItem(DocumentForm):
   class Meta:
       document = GenericItem
       fields = ('title', 'value', 'description')

查看我处理表单的位置

@login_required
def add_item(request, category):

    if request.method == 'POST':        

        if category == 'Muffins':
            form = ModelFormMuffin(request.POST)        

        elif category == 'Cameras':
            form = ModelFormCameras(request.POST)        

        else:        
            form = ModelFormGenericItem(request.POST)

        form = ModelFormGenericItem(request.POST)

        if form.is_valid():
            #process the data in form.cleaned_data

            instance = form.save(commit = False)
            instance.owner_id = request.user.id
            instance.save(safe=True, cascade=)

            return HttpResponseRedirect('/thanks/')

    else:
        # Ensure that this is a "final" category:
        p = get_object_or_404( Category, categoryTitle = category )        
        i = Category.objects.filter( parentCategory = p )
        if i.count() != 0:
            raise Http404

        if category == 'Muffins':
            form = ModelFormMuffin()

        elif category == 'Cameras':
            form = ModelFormCameras()

        else:        
            form = ModelFormGenericItem()

    return render(request, 'item.html', {
        'form': form,
        'category': category,
    } )

更多来自 Django 错误：

/Users/holografix/Documents/development/troca_proj/troca_app/views.py in add_item
            instance.save() ...
▶ Local vars
/Users/holografix/.virtualenvs/troca/lib/python2.7/site-packages/mongoengine/document.py in save
            warn_cascade = not cascade and 'cascade' not in self._meta ...
▶ Local vars
/Users/holografix/.virtualenvs/troca/lib/python2.7/site-packages/mongodbforms/documentoptions.py in __getitem__
        return self.meta[key] ...
▶ Local vars
4

1 回答 1

0

编辑：为 documentoptions.py 实现contains () 方法似乎可以修复它，而无需更改任何其他内容。

最终解决了这个问题，因为我不知道为什么会这样......

向 mongodbforms.documentoptions 添加了“has_key()”方法，如下所示：

def has_key(self, key):
    return self.meta.has_key(key)

并将违规行从 mongoengine 从in运算符更改为检查 has_key() 方法：

warn_cascade = not cascade and not self._meta.has_key('cascade')

如果有人能回答 WTF 原始错误正在弹出，那就太棒了！

于 2013-02-02T11:51:06.933 回答