[英]Filter Queryset in Django inlineformset_factory
我试图使用inlineformset_factory来生成一个formset。 我的模型定义为:
class Measurement(models.Model):
subject = models.ForeignKey(Subject)
experiment = models.ForeignKey(Experiment)
assay = models.ForeignKey(Assay)
values = models.CommaSeparatedIntegerField(blank=True, null=True)
class Experiment(models.Model):
date = models.DateField()
notes = models.TextField(max_length = 500, blank=True)
subjects= models.ManyToManyField(Subject)
在我看来,我有:
def add_measurement(request, experiment_id):
experiment = get_object_or_404(Experiment, pk=experiment_id)
MeasurementFormSet = inlineformset_factory(Experiment, Measurement, extra=10, exclude=('experiment'))
if request.method == 'POST':
formset = MeasurementFormSet(request.POST,instance=experiment)
if formset.is_valid():
formset.save()
return HttpResponseRedirect( experiment.get_absolute_url() )
else:
formset = MeasurementFormSet(instance=experiment)
return render_to_response("data_entry_form.html", {"formset": formset, "experiment": experiment }, context_instance=RequestContext(request))
但我想将Measurement.subject字段限制为只在Experiment.subjects查询集中定义的主题。 我尝试了几种不同的方法,但我不确定实现这一目标的最佳方法是什么。 我试图用新的查询集覆盖BaseInlineFormset类,但无法弄清楚如何正确传递实验参数。
更新的答案 (我还将此处的信息作为将参数传递给formset 链接的方式 ):
views.py
def add_measurement(request, experiment_id):
experiment = get_object_or_404(Experiment, pk=experiment_id)
MeasurementFormSet = inlineformset_factory(Experiment, Measurement, extra=10, can_delete=True, form=MeasurementForm)
MeasurementFormSet.form = staticmethod(curry(MeasurementForm, experiment=experiment))
if request.method == 'POST':
formset = MeasurementFormSet(request.POST)
if formset.is_valid():
formset.save()
return HttpResponseRedirect( experiment.get_absolute_url() )
else:
formset = MeasurementFormSet()
return render_to_response("data_entry_form.html", {"formset": formset, "experiment": experiment }, context_instance=RequestContext(request))
forms.py
class MeasurementForm(ModelForm):
class Meta:
model = Measurement
def __init__(self, *args, **kwargs):
experiment = kwargs.pop('experiment')
super(MeasurementForm, self).__init__(*args, **kwargs)
self.fields["subject"].queryset = Subject.objects.filter(experiment=experiment)
(编辑:没有正确读取代码块,这里应该是你的问题的解决方案):
我相信你需要: http : //docs.djangoproject.com/en/dev/ref/forms/fields/#modelchoicefield
Forms.py:
class MeasurementForm(ModelForm):
subject = forms.ModelChoiceField(queryset = Expirement.objects.all())
class Meta:
model = Measurement
Views.py:
inlineformset_factory(
Experiment, Measurement, extra=10,
exclude=('experiment'), form=MeasurementForm
)
使用表单参数绑定到formset。
我遇到了同样的问题(使用有限的可能值初始化inlineforms),并且更新后的答案效果很好。 感谢那。 无论如何,我认为有些事情可以做得更好,但我不知道如何完成它。 该解决方案中的新问题是您在每个内联形式中访问数据库:而不是在所有相同的字段中使用相同的查询集,每次在此行中重新计算它:
self.fields["subject"].queryset = Subject.objects.filter(experiment=experiment)
我在这个问题上是对的还是引擎盖后面还有一些懒惰的魔法? 如果我是对的,我怎么能避免DB的可能百分之一? 问候,佩德罗
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