使用内联表单集添加行时出现 MultiValueDictKeyError

Question

我正在尝试使用我之前在表单集工厂中使用的相同方法在内联表单集工厂中添加更多行，但出现错误：

MultiValueDictKeyError form-TOTAL_FORMS'

models.py:

    class ttransactions(models.Model):
    transaction_type = models.CharField(max_length=10, choices=tx_choices)
    description = models.CharField(max_length=50, null=False, blank=False, default='Description')
    transaction_date = models.DateField(default=datetime.today, db_index=True)
    company = models.ForeignKey(tcompany, on_delete=models.PROTECT, db_index=True)


    def __str__(self):
        return self.description


class ttransaction_lines(models.Model):
    transaction = models.ForeignKey(ttransactions, on_delete=models.PROTECT, db_index=True)
    sequence = models.IntegerField()
    transaction_type = models.CharField(max_length=6, choices=debit_credit)
    ledger_account = models.ForeignKey(tledger_account, on_delete=models.PROTECT, db_index=True)
    amount = models.DecimalField(max_digits=14, decimal_places=2, default=0.0)
    vat_amount = models.DecimalField(max_digits=14, decimal_places=2, default=0.0)
    vat_code = models.ForeignKey(tvat, on_delete=models.PROTECT, blank=True, null=True)
    quantity = models.IntegerField(blank=True, null=True)
    posted = models.BooleanField(default=True)

forms.py:

    class TransactionsForm(forms.ModelForm):
    transaction_date = forms.DateField(widget=forms.SelectDateWidget(years=year_range), initial=datetime.today)

    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request')
        super(TransactionsForm, self).__init__(*args, **kwargs)

    class Meta:
        model = ttransactions
        fields = ['description',
                  'transaction_date']

class TransactionLinesForm(forms.ModelForm):
    class Meta:
        model = ttransaction_lines
        fields = ['transaction_type', 'ledger_account', 'amount']
   
class BaseTransactionLinesFormSet(BaseModelFormSet):
    def clean(self):
        super(BaseTransactionLinesFormSet, self).clean()
        # Check errors dictionary first, if there are any error, no point in validating further
        if any(self.errors):
            return
        balance = 0
        for form in self.forms:
            if form.cleaned_data['DELETE'] == True or form.cleaned_data['DELETE'] == '':
                continue
            if form.cleaned_data['transaction_type']=='Debit':
                balance = balance + form.cleaned_data['amount']
            else:
                balance = balance - form.cleaned_data['amount']

        if balance != 0:
            message = 'Transactions not balanced (excluding deleting lines)'
            raise forms.ValidationError(message)
            
TransactionLineFormset = inlineformset_factory(ttransactions,
                                               ttransaction_lines,
                                               form=TransactionLinesForm,
                                               can_order=True, can_delete=True)

views.py

class JournalCreateView(LoginRequiredMixin, CreateView):
template_name = 'accounting/journal.html'
model = ttransactions
formset = TransactionLineFormset
form_class = TransactionsForm

success_url = '/accounting/transaction_list'

def get_form_kwargs(self):
    kwargs = super(JournalCreateView, self).get_form_kwargs()
    kwargs['request'] = self.request
    return kwargs

def get(self, request, *args, **kwargs):
    self.object = None
    form_class = self.get_form_class()
    form = self.get_form(form_class)

    formset = TransactionLineFormset(queryset=ttransaction_lines.objects.none())

    formset.form.base_fields['ledger_account'].queryset = \
        tledger_account.objects.filter(company=request.user.current_company)

    return self.render_to_response(
        self.get_context_data(form=form, formset=formset))

def post(self, request, *args, **kwargs):
    extra_forms = 1
    if 'additems' in request.POST and request.POST['additems'] == 'true':
        formset_dictionary_copy = self.request.POST.copy()
        formset_dictionary_copy['form-TOTAL_FORMS'] = \
            int(formset_dictionary_copy['form-TOTAL_FORMS']) + extra_forms
        formset = TransactionLineFormSet(formset_dictionary_copy)
        return self.render_to_response(
            self.get_context_data(form=form,
                                  formset=formset))

    self.object = None
    form_class = self.get_form_class()
    form = self.get_form(form_class)

    formset = TransactionLineFormset(self.request.POST)
    if (form.is_valid() and formset.is_valid()):
        return self.form_valid(form, formset)
    else:
        return self.form_invalid(form, formset)

def form_valid(self, form, formset):
    form.instance.company = self.request.user.current_company
    self.object = form.save()

    sequence = 1
    for line in formset:
        line.instance.sequence = sequence
        sequence += 1

    formset.instance = self.object
    formset.save()
    return super().form_valid(form)

def form_invalid(self, form, formset):
    return self.render_to_response(
        self.get_context_data(form=form,
                              formset=formset))

我在字典复制行的那一行得到了错误。添加行的代码在post函数中添加。我不确定那是否是添加此代码的正确位置。帮助将不胜感激。

Answer 1

如果提交的表单缺少密钥，则会出现此错误。

.get() 方法允许在访问字典中缺少的键时使用默认值。

formset_dictionary_copy['form-TOTAL_FORMS'] = \ 
    int(formset_dictionary_copy.get('form-TOTAL_FORMS', 1)) + extra_forms

看来，表单集没有获取它的所有隐藏值，或者提交了不同的表单。

我会考虑前端解决方案或发送带有添加按钮值的单个初始表单集。

前端/js示例： https://www.brennantymrak.com/articles/django-dynamic-formsets-javascript

使用内联表单集添加行时出现 MultiValueDictKeyError

MultiValueDictKeyError hen adding lines with inlineformset

django

inline-formset