Django中的内联表单验证-Java 学习之路

我想在管理员更改表格中强制执行整个内联表单集 . 因此，在我目前的情况下，当我点击发票表单上的保存时（在管理员中），内联订单表格为空白 . 我想阻止人们创建没有订单关联的发票 .

有人知道一个简单的方法吗？

模型字段上的（ required=True ）等正常验证似乎不适用于此实例 .

5 回答

执行此操作的最佳方法是使用clean方法定义自定义formset，该方法验证至少存在一个发票订单 .

class InvoiceOrderInlineFormset(forms.models.BaseInlineFormSet):
    def clean(self):
        # get forms that actually have valid data
        count = 0
        for form in self.forms:
            try:
                if form.cleaned_data:
                    count += 1
            except AttributeError:
                # annoyingly, if a subform is invalid Django explicity raises
                # an AttributeError for cleaned_data
                pass
        if count < 1:
            raise forms.ValidationError('You must have at least one order')

class InvoiceOrderInline(admin.StackedInline):
    formset = InvoiceOrderInlineFormset


class InvoiceAdmin(admin.ModelAdmin):
    inlines = [InvoiceOrderInline]

回复于 2024-05-05T00:01:31+08:00

18
Daniel的答案非常好，它在一个项目上对我有用，但后来我意识到由于Django的工作方式，如果你使用can_delete并在保存时检查删除框，则可以验证没有任何订单（在此案件） .

我花了一些时间试图弄清楚如何防止这种情况发生 . 第一种情况很简单 - 不包括将在计数中删除的表单 . 第二种情况比较棘手......如果检查了所有删除框，则没有调用 clean .

遗憾的是，代码并不简单 . 从 full_clean 调用 clean 方法，该方法在访问 error 属性时调用 . 删除子表单时不会访问此属性，因此永远不会调用 full_clean . 我不是Django的专家，所以这可能是一种可怕的方式，但似乎有效 .

这是修改后的类：
```
class InvoiceOrderInlineFormset(forms.models.BaseInlineFormSet):
    def is_valid(self):
        return super(InvoiceOrderInlineFormset, self).is_valid() and \
                    not any([bool(e) for e in self.errors])

    def clean(self):
        # get forms that actually have valid data
        count = 0
        for form in self.forms:
            try:
                if form.cleaned_data and not form.cleaned_data.get('DELETE', False):
                    count += 1
            except AttributeError:
                # annoyingly, if a subform is invalid Django explicity raises
                # an AttributeError for cleaned_data
                pass
        if count < 1:
            raise forms.ValidationError('You must have at least one order')
```
回复于 2024-05-05T00:01:31+08:00

@Daniel Roseman解决方案很好，但是我做了一些修改，只用了一些代码来做同样的事情 .

class RequiredFormSet(forms.models.BaseInlineFormSet):
      def __init__(self, *args, **kwargs):
          super(RequiredFormSet, self).__init__(*args, **kwargs)
          self.forms[0].empty_permitted = False

class InvoiceOrderInline(admin.StackedInline):
      model = InvoiceOrder
      formset = RequiredFormSet


class InvoiceAdmin(admin.ModelAdmin):
     inlines = [InvoiceOrderInline]

试试这个它也有效:)

回复于 2024-05-05T00:01:31+08:00

class MandatoryInlineFormSet(BaseInlineFormSet):  

    def is_valid(self):
        return super(MandatoryInlineFormSet, self).is_valid() and \
                    not any([bool(e) for e in self.errors])  
    def clean(self):          
        # get forms that actually have valid data
        count = 0
        for form in self.forms:
            try:
                if form.cleaned_data and not form.cleaned_data.get('DELETE', False):
                    count += 1
            except AttributeError:
                # annoyingly, if a subform is invalid Django explicity raises
                # an AttributeError for cleaned_data
                pass
        if count < 1:
            raise forms.ValidationError('You must have at least one of these.')  

class MandatoryTabularInline(admin.TabularInline):  
    formset = MandatoryInlineFormSet

class MandatoryStackedInline(admin.StackedInline):  
    formset = MandatoryInlineFormSet

class CommentInlineFormSet( MandatoryInlineFormSet ):

    def clean_rating(self,form):
        """
        rating must be 0..5 by .5 increments
        """
        rating = float( form.cleaned_data['rating'] )
        if rating < 0 or rating > 5:
            raise ValidationError("rating must be between 0-5")

        if ( rating / 0.5 ) != int( rating / 0.5 ):
            raise ValidationError("rating must have .0 or .5 decimal")

    def clean( self ):

        super(CommentInlineFormSet, self).clean()

        for form in self.forms:
            self.clean_rating(form)


class CommentInline( MandatoryTabularInline ):  
    formset = CommentInlineFormSet  
    model = Comment  
    extra = 1

回复于 2024-05-05T00:01:31+08:00

4
我们在2018年有很多很棒的新闻！唐纳德特朗普今天是美国的坚持者，我们仍在努力解决所需的内联问题 .

情况变得更好但仍需要一些解决方法 . Django现在提供 validate_min 和 min_num attrs，如果 min_num 取自 Inline durring formset instantinating， validate_min 只能作为init formset参数传递 . 所以解决方案看起来像这样：
```
class MinValidatedInlineMixIn:
    validate_min = True
    def get_formset(self, *args, **kwargs):
        return super().get_formset(validate_min=self.validate_min, *args, **kwargs)

class InvoiceOrderInline(MinValidatedInlineMixIn, admin.StackedInline):
    model = InvoiceOrder
    min_num = 1
    validate_min = True

class InvoiceAdmin(admin.ModelAdmin):
    inlines = [InvoiceOrderInline]
```
回复于 2024-05-05T00:01:31+08:00

Django中的内联表单验证

5 回答

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