django - 如何在 Django 中将 InlineFormSet 放入 ModelFormSet 中？

Question

我想通过 ModelFormSet 显示多个表单，其中每个表单依次显示连接到该对象的所有对象的 InlineFormSets。

现在我不太确定如何为每个 ModelFormSet 提供实例。我考虑过对 BaseModelFormSet 进行子类化，但我不知道从哪里开始，并且想在经历所有麻烦之前知道这是否可行。

提前致谢!

Answer 1

我找到了一篇文章，重点讨论了确切的问题。效果很好!

http://yergler.net/blog/2009/09/27/nested-formsets-with-django/

为了完整起见，我复制了代码片段:

class Block(models.Model):
    description = models.CharField(max_length=255)

class Building(models.Model):
    block = models.ForeignKey(Block)
    address = models.CharField(max_length=255)

class Tenant(models.Model):
    building = models.ForeignKey(Building)
    name = models.CharField(max_length=255)
    unit = models.CharField(max_length=255)

form django.forms.models import inlineformset_factory, BaseInlineFormSet

TenantFormset = inlineformset_factory(models.Building, models.Tenant, extra=1)

class BaseBuildingFormset(BaseInlineFormSet): 

    def add_fields(self, form, index):
        # allow the super class to create the fields as usual
        super(BaseBuildingFormset, self).add_fields(form, index)

        # created the nested formset
        try:
            instance = self.get_queryset()[index]
            pk_value = instance.pk
        except IndexError:
            instance=None
            pk_value = hash(form.prefix)

        # store the formset in the .nested property
        form.nested = [
            TenantFormset(data=self.data,
                            instance = instance,
                            prefix = 'TENANTS_%s' % pk_value)]

BuildingFormset = inlineformset_factory(models.Block, models.Building, formset=BaseBuildingFormset, extra=1)