[英]Filter Queryset in Django inlineformset_factory
我試圖使用inlineformset_factory來生成一個formset。 我的模型定義為:
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)
在我看來,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))
但我想將Measurement.subject字段限制為只在Experiment.subjects查詢集中定義的主題。 我嘗試了幾種不同的方法,但我不確定實現這一目標的最佳方法是什么。 我試圖用新的查詢集覆蓋BaseInlineFormset類,但無法弄清楚如何正確傳遞實驗參數。
更新的答案 (我還將此處的信息作為將參數傳遞給formset 鏈接的方式 ):
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)
(編輯:沒有正確讀取代碼塊,這里應該是你的問題的解決方案):
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
)
使用表單參數綁定到formset。
我遇到了同樣的問題(使用有限的可能值初始化inlineforms),並且更新后的答案效果很好。 感謝那。 無論如何,我認為有些事情可以做得更好,但我不知道如何完成它。 該解決方案中的新問題是您在每個內聯形式中訪問數據庫:而不是在所有相同的字段中使用相同的查詢集,每次在此行中重新計算它:
self.fields["subject"].queryset = Subject.objects.filter(experiment=experiment)
我在這個問題上是對的還是引擎蓋后面還有一些懶惰的魔法? 如果我是對的,我怎么能避免DB的可能百分之一? 問候,佩德羅
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