Question

我想在管理员更改表单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。

任何人都知道一种简单的方法吗？

模型字段上的正常验证（如required=True）似乎在此实例中不起作用。

Answer 1

执行此操作的最佳方法是使用clean方法定义自定义formset，以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]

Answer 2

Daniel的回答非常好，在一个项目中对我有用，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（在这种情况下）。

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 all 选中了删除框，则表示clean没有被调用。

遗憾的是，代码并不简单。从clean调用full_clean方法，在访问error属性时调用该方法。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专家，所以这可能是一种可怕的方式，但它似乎有效。

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')

Answer 3

@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]

试试这个也有效：）

Answer 4

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

Answer 5

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个attrs，如果min_num取自Inline在即时形式下，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]

Django中的内联表单验证

5 个答案: