Python 如何在Django模型表单中引用当前对象？

我有两个相关的型号，公司和包装。每个公司可以有几个包，但只有一个默认的_包。以下是模型：

class Company(models.Model):
    default_package = models.OneToOneField(
        Package,
        blank=True,
        null=True,
        related_name='default_for_%(class)s')

至于包装

我正试图为该公司制作一个通用的CreateView和UpdateView，如下所示：

class EditViewsMixin(DashboardAccessMixin, SuccessMessageMixin):
    model = Company
    success_url = reverse_lazy('dashboard:companies')
    form_class = CompanyForm


class CompanyCreate(EditViewsMixin, CreateView):
    template_name = 'companies/new.html'
    success_message = "Company '%(name)s' was created successfully"


class CompanyUpdate(EditViewsMixin, UpdateView):
    template_name = 'companies/edit.html'
    success_message = "Company '%(name)s' was updated successfully"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['packages'] = self.object.package_set.order_by('name')
        return context

def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    self.fields['default_package'].queryset = Package.objects.filter(company=self.instance)

公司形式类似于以下内容：

class CompanyForm(forms.ModelForm):
    class Meta:
        model = Company
        fields = [
            'name',
            'default_package',
        ]

问题是，在这种形式中，默认的包下拉菜单显示所有包，而我希望它显示正在考虑的公司包集中的包，类似于在视图的get\u context\u data方法中引用self.object所做的

本质上，我想在公司形式中做一些类似的事情：

---

但是，这是不可能的，因为在这个级别上没有定义self。是否有某种模型形式的方法，如get_queryset for a specific field，在其中我可以使用self.instance定义queryset？

我通过更新模型形式的uuu init_uuu中的字段来实现这一点，如下所示：

class EditViewsMixin(DashboardAccessMixin, SuccessMessageMixin):
    model = Company
    success_url = reverse_lazy('dashboard:companies')
    form_class = CompanyForm


class CompanyCreate(EditViewsMixin, CreateView):
    template_name = 'companies/new.html'
    success_message = "Company '%(name)s' was created successfully"


class CompanyUpdate(EditViewsMixin, UpdateView):
    template_name = 'companies/edit.html'
    success_message = "Company '%(name)s' was updated successfully"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['packages'] = self.object.package_set.order_by('name')
        return context

def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    self.fields['default_package'].queryset = Package.objects.filter(company=self.instance)

---

你试过了吗？根据，ModelFormMixin的get_form_kwargs添加了self.object。您可能只需要执行self.instance.package_set。