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PODjango MongodbForms KeyError _meta['cascade']
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copied!<p>Trying to use Django MongoDBForms to replace ModelForms but I get this really weird error when saving the instance of the form. </p> <p>During save(), mongoengine.Document checks for the cascade keyword in the _meta dict which MongoDBForm wraps. </p> <p>MongoDBForm then throws a KeyError from <strong>getitem</strong> </p> <p>What's that cascade key it's looking for?!</p> <p>Am I doing it wrong?</p> <pre><code>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 </code></pre> <p><strong>The model from models.py</strong></p> <pre><code>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 </code></pre> <p><strong>ModelForm equivalent in forms.py</strong></p> <pre><code>class ModelFormGenericItem(DocumentForm): class Meta: document = GenericItem fields = ('title', 'value', 'description') </code></pre> <p><strong>View where I process the form</strong></p> <pre><code>@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, } ) </code></pre> <p>More from the Django error:</p> <pre><code>/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 </code></pre>

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