这是this question的延续,其中我想弄清楚如何构建由经纬度FloatFields组成的PointField。我已@西蒙的建议和重组我的模型看起来像这样:Django:从表格中保存外键
class Point(models.Model):
lat = models.FloatField()
lon = models.FloatField()
class Thing(models.Model):
point = models.ForeignKey(Point)
我的形式有相应的从谷歌地图经度和纬度值两个字段坐标:
class StepThreeForm(forms.Form):
lat = forms.FloatField()
lon = forms.FloatField()
...
然而,这并不明显的原因工作,但我不知道如何解决它。为了澄清,我试图有两个对应于外键值lat
和lon
的表单字段。这里是补充信息(我使用的是FormWizard和forms.Form):
url(r'^mapform/$', login_required(MyWizard.as_view([StepOneForm, StepTwoForm, StepThreeForm])), name='create'),
class MyWizard(SessionWizardView): ## this view also serves to edit existing objects and provide their instances
def done(self, form_list, **kwargs):
id = form_list[0].cleaned_data['id']
try:
thing = Thing.objects.get(pk=id)
instance = thing
except:
thing = None
instance = None
if thing and thing.user != self.request.user:
raise HttpResponseForbidden()
if not thing:
instance = Thing()
for form in form_list:
for field, value in form.cleaned_data.iteritems():
setattr(instance, field, value)
instance.user = self.request.user
instance.save()
return render_to_response('wizard-done.html', {
'form_data': [form.cleaned_data for form in form_list],})
我明白任何和所有的建议和帮助!
编辑:基于Yuji Tomita的输入更新。它大部分都很有意义(谢谢!),但我不确定它为什么会导致ValueError。
class MyWizard(SessionWizardView):
....
for form in form_list:
form.save(instance)
...
class StepOneForm(forms.Form):
...
def save(self, thing):
for field, value in self.cleaned_data.items():
setattr(thing, field, value)
class StepTwoForm(forms.Form):
...
def save(self, thing):
for field, value in self.cleaned_data.items():
setattr(thing, field, value)
我相信,我应该保持表单字段为纬度和经度,因为我用我的形式的谷歌地图,并采取纬度和经度从选定的输入,然后从这些值建构一个点领域:
class StepThreeForm(forms.Form):
lat = forms.FloatField()
lon = forms.FloatField()
def save(self, thing):
thing.point = Point.objects.get_or_create(lat=self.cleaned_data.get('lat'), lon=self.cleaned_data.get('lon'))
这将产生ValueError: Cannot assign "(<Point: Point object>, False)": "Thing.point" must be a "Point" instance.
Traceback:
File "/lib/python2.7/django/core/handlers/base.py" in get_response
111. response = callback(request, *callback_args, **callback_kwargs)
File "/lib/python2.7/django/contrib/auth/decorators.py" in _wrapped_view
20. return view_func(request, *args, **kwargs)
File "/lib/python2.7/django/views/generic/base.py" in view
48. return self.dispatch(request, *args, **kwargs)
File "/lib/python2.7/django/contrib/formtools/wizard/views.py" in dispatch
223. response = super(WizardView, self).dispatch(request, *args, **kwargs)
File "/lib/python2.7/django/views/generic/base.py" in dispatch
69. return handler(request, *args, **kwargs)
File "/lib/python2.7/django/contrib/formtools/wizard/views.py" in post
286. return self.render_done(form, **kwargs)
File "/lib/python2.7/django/contrib/formtools/wizard/views.py" in render_done
328. done_response = self.done(final_form_list, **kwargs)
File "/myproject/myapp/forms.py" in done
93. form.save(instance)
File "/myproject/myapp/forms.py" in save
67. thing.point = Thing.objects.get_or_create(lat=self.cleaned_data.get('lat'), lon=self.cleaned_data.get('lon'))
File "/lib/python2.7/django/db/models/fields/related.py" in __set__
366. self.field.name, self.field.rel.to._meta.object_name))
请编辑您的[原题] (http://stackoverflow.com/questions/19167076/django-filtering-queryset-from-two-model-fields)而不是分散在多个线程。 –
我的理解是,如果一个问题与原始问题不同,我应该提出一个新问题。前一个问题涉及如何基于两个独立的模型字段进行“过滤”。它被回答了。这个主题是不同的,因为它要求如何从表单中保存'ForeignKey'字段,这完全不同于基于两个模型字段组合的过滤。如果我错了,我会感谢主持人澄清。谢谢! –
@NickB,你在这里完全没问题。阅读帖子时,我们都会做出突然的假设。感谢您的公民! –