Django：强制管理员用户在 TabularInline 中输入至少一项

Question

在我的管理对象Chair 中，我有一个TabularInline 用于任意数量的Desk 对象。我希望每个Chair 始终至少有一个与之关联的Desk 对象。有没有办法让管理界面强制用户输入至少一个Desk？如果没有输入Desk 则显示错误？

Answer 1

使用 akaihola 的回答，这里有一个更完整的例子：

将此添加到您的 forms.py：

from django import forms
from django.forms.models import BaseInlineFormSet

class AtLeastOneRequiredInlineFormSet(BaseInlineFormSet):

    def clean(self):
        """Check that at least one service has been entered."""
        super(AtLeastOneRequiredInlineFormSet, self).clean()
        if any(self.errors):
            return
        if not any(cleaned_data and not cleaned_data.get('DELETE', False)
            for cleaned_data in self.cleaned_data):
            raise forms.ValidationError('At least one item required.')

然后，在你的 admin.py 中：

class DeskInline(admin.TabularInline):
    model = Desk
    formset = AtLeastOneRequiredInlineFormSet

class ChairAdmin(admin.ModelAdmin):
    inlines = [DeskInline,]

admin.site.register(Chair, ChairAdmin)

Answer 2

需要至少一项的通用 FormSet clean() 方法：

    def clean(self):
        """Check that at least one service has been entered."""
        super(MyFormSet, self).clean()
        if any(self.errors):
            return
        if not any(cleaned_data and not cleaned_data.get('DELETE', False)
                   for cleaned_data in self.cleaned_data):
            raise forms.ValidationError('At least one item required.')

这应该适用于普通表单集、模型表单集和内嵌模型表单集。

Answer 3

Matthew Flanagan 有一个很好的例子来说明如何在表单集中要求一个有效的表单：http://code.google.com/p/wadofstuff/wiki/WadOfStuffDjangoForms 和 http://wadofstuff.blogspot.com/2009/08/requiring-at-least-one-inline-formset.html 希望对您有所帮助。