保存Django Formsets

Question

以下代码成功地将新ToolCalibration添加到我的数据库，但它不保存SerialFormset或PartFormset。我一直在盯着这段代码试图弄清楚它已经有一段时间了，所以任何和所有的帮助都会非常感激。谢谢！

Forms.py

from django.forms import ModelForm
from django.forms.models import inlineformset_factory
from tool_cal.models import ToolCalibration, SerialNumber, PartNumber

class ToolForm(ModelForm):
    class Meta:
        model = ToolCalibration

SerialFormSet = inlineformset_factory(ToolCalibration, SerialNumber, can_delete=True)
PartFormSet = inlineformset_factory(ToolCalibration, PartNumber, can_delete=True)

Views.py

class ToolCreate(CreateView):
model = ToolCalibration
template_name = "create.html"
form_class = ToolForm
success_url = '/toolcal/success'

def get(self, request, *args, **kwargs):
    """
    Handles GET requests and instantiates blank versions of the form
    and its inline formsets.
    """
    self.object = None
    form_class = self.get_form_class()
    form = self.get_form(form_class)
    serial_form = SerialFormSet(prefix='serial')
    part_form = PartFormSet(prefix='part')
    return self.render_to_response(
        self.get_context_data(form=form,
                              serial_form=serial_form,
                              part_form=part_form))

def post(self, request, *args, **kwargs):
    """
    Handles POST requests, instantiating a form instance and its inline
    formsets with the passed POST variables and then checking them for
    validity.
    """
    self.object = None
    form_class = self.get_form_class()
    form = self.get_form(form_class)
    serial_form = SerialFormSet(self.request.POST, prefix='serial')
    part_form = PartFormSet(self.request.POST, prefix='part')
    if (form.is_valid() and serial_form.is_valid() and
        part_form.is_valid()):
        return self.form_valid(form, serial_form, part_form)
    else:
        return self.form_invalid(form, serial_form, part_form)

def form_valid(self, form, serial_form, part_form):
    """
    Called if all forms are valid. Creates a ToolCalibration instance along with
    associated Serial and Parts and then redirects to a
    success page.
    """
    self.object = form.save()
    serial_form.instance = self.object
    serial_form.save()
    part_form.instance = self.object
    part_form.save()
    return HttpResponseRedirect(self.get_success_url())

def form_invalid(self, form, serial_form, part_form):
    """
    Called if a form is invalid. Re-renders the context data with the
    data-filled forms and errors.
    """
    return self.render_to_response(
        self.get_context_data(form=form,
                              serial_form=serial_form,
                              part_form=part_form))

Answer 1

您是否考虑过使用django-extra-views？它包含一个快速简便的CBV来处理InlineFormSets。

除了InlineFormSetView和GenericInlineFormSetView之外，他们还有CreateWithInlinesView，这似乎正是您想要的。相关文档here。

示例：

from extra_views import InlineFormSet, CreateWithInlinesView, UpdateWithInlinesView,
from extra_views.generic import GenericInlineFormSet

from tool_cal.models import ToolCalibration, SerialNumber, PartNumber    


class SerialNumberInline(InlineFormSet):
    model = SerialNumber


class PartNumberInline(GenericInlineFormSet):
    model = PartNumber


class ToolCreateView(CreateWithInlinesView):
    model = ToolCalibration
    inlines = [SerialNumberInline, PartNumberInline]

    def get_success_url(self):
        return self.object.get_absolute_url()

即使您不想使用它们，您也可以挖掘代码并了解它们如何处理它们。