Django InlineFormSet验证 [英] Django InlineFormSet validation

问题描述

我有一个 BaseInlineFormSet ，我想根据子域的值来验证父表单中的一个域.如文档，进行自定义验证的唯一方法是 clean()，但我找不到仅向子级添加错误到父级表单的方法.

I have a BaseInlineFormSet, and I'd like to validate a field in the parent form based on the values on the fields of the children. As seen in the docs, the only method to make a custom validation is clean(), but I can't find a way to add errors to the parent form, only for the children.

在以下代码中，我建立了一个公式.每个变量都来自内部表单，如果全局公式未通过验证，我想向父级的表单字段 formula

In the following code I build a formula. Each variable comes from a inner form, and if the global formula don't validate, I'd like to add an error to the parent's form field formula

class CustomInlineFormSet(BaseInlineFormSet):
    def clean(self):
        formula = self.instance.formula
        variables = []
        for form in self.forms:
            if 'formula_variable' in form.cleaned_data:
                variables.append(form.cleaned_data['formula_variable'])

        valid, msg = validate_formula(formula, variables)
        if not valid:
            WHAT HERE???

推荐答案

感谢 Russell Keith-Magee ，我设法解决这个问题.我将在此处详细说明答案，以供将来参考.

Thanks to Russell Keith-Magee, I managed to solve this. I detail the answer here for future reference.

我做错了，InlineFormSet不是执行所需验证的正确位置，应该在父ModelForm中完成.但是父ModelForm无权访问子FormSet，因此我只需要将FormSet作为参数传递给ModelForm.所以事情现在看起来像这样:

I was doing it wrong, the InlineFormSet was not the right place to do the kind of validation I needed, it should be done in the parent ModelForm. But the parent ModelForm don't have access to the child FormSet, so I just need to pass the FormSet to the ModelForm as a parameter. So the thing looks like this now:

视图:

class FormulaCreate(CreateView):
    model = Formula
    template_name = "whatever.html"

    def get_context_data(self, **kwargs):
        context = super(ParameterRatioCreate, self).get_context_data(**kwargs)
        if self.request.POST:
            formset = FormulaVariablesFormSet(self.request.POST, instance=self.object)
            context['form'] = FormulaForm(formset=formset, data=self.request.POST, instance=self.object)
            context['formset'] = formset
        else:
            formset = FormulaVariablesFormSet(instance=self.object)
            context['form'] = FormulaForm(formset=formset, instance=self.object)
            context['formset'] = formset

        return context

    def form_valid(self, form):
        context = self.get_context_data()
        form = context['form']
        formset = context['formset']
        if form.is_valid() and formset.is_valid():
            ratio = form.save()
            formset = FormulaVariablesFormSet(self.request.POST, instance=ratio)
            if formset.is_valid():
                formset.save()
                self.object = ratio
                return redirect(self.get_success_url())

        context['formset'] = formset
        return self.render_to_response(context)

表格:

class FormulaForm(forms.ModelForm):
    class Meta:
        model = Formula

    def __init__(self, formset, *args, **kwargs):
        self.formset = formset
        super(FormulaForm, self).__init__(*args, **kwargs)

    def clean(self):
        variables = {}
        for form in self.formset:
            if form.is_valid() and 'formula_variable' in form.cleaned_data:
                variables[form.cleaned_data['formula_variable']] = 1

        if 'formula' in self.cleaned_data:
            formula = self.cleaned_data['formula']
            valid, msg = do_formula(formula, variables)
            if not valid:
                self._errors['formula'] = self.error_class([msg])
                del self.cleaned_data['formula']

        return self.cleaned_data

FormSet:

FormulaVariablesFormSet = inlineformset_factory(Formula,
                                                FormulaVariable,
                                                extra=1)

这篇关于Django InlineFormSet验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！