在Django Admin上过滤内联时出现验证错误

Question

有一个发票模型和两个定价模型来计算结算金额。我希望Django admin上的Invoice项目的详细信息页面显示由Invoice模型（pricing_type）的属性确定的唯一一个内联。

为了实现上述目标，我编写了下面的代码，但是当我使用修改后的django.core.exceptions.ValidationError: ['ManagementForm data is missing or has been tampered with']在Django admin上保存Invoice项时，它引发了一个错误（pricing_type）。如何在可切换的详细页面上进行内联？

环境

• Django 2.0
• Python 3.6.3

models.py

class Invoice(models.Model):
    pricing_type = models.CharField(
        max_length=1,
        choices=(
            ('A', 'Pricing type A'),
            ('B', 'Pricing type B'),
        ),
        default='A')


class PricingA(models.Model):
    invoice = models.ForeignKey(Invoice, models.CASCADE)


class PricingB(models.Model):
    invoice = models.ForeignKey(Invoice, models.CASCADE)

admin.py

class PricingAInline(admin.TabularInline):
    model = PricingA


class PricingBInline(admin.TabularInline):
    model = PricingB


@admin.register(Invoice)
class InvoiceAdmin(admin.ModelAdmin):
    inlines = [PricingAInline, PricingBInline]

    def get_formsets_with_inlines(self, request, obj=None):
        for inline in self.get_inline_instances(request, obj):
            if isinstance(inline, PricingAInline) and obj is not None and obj.pricing_type == 'A':
                yield inline.get_formset(request, obj), inline
            elif isinstance(inline, PricingBInline) and obj is not None and obj.pricing_type == 'B':
                yield inline.get_formset(request, obj), inline
            continue

Answer 1

我决定添加自定义模板和自定义标记，以便在模板级别而不是get_formsets_with_inlines()中过滤内联内容。它按我的意愿运作。

MY_PROJECT /模板/管理/ edit_inline / tabular.html

{% load i18n admin_urls static admin_modify %}
{% load customs %}
<div class="js-inline-admin-formset inline-group" id="{{ inline_admin_formset.formset.prefix }}-group"
     data-inline-type="tabular"
     data-inline-formset="{{ inline_admin_formset.inline_formset_data }}"
     {% visible_inline adminform.form.instance.pricing_type.class_name inline_admin_formset.opts.model %}>

...

MY_PROJECT / my_app应用/ templatetags / customs.py

from django import template
from django.utils.safestring import mark_safe

register = template.Library()


@register.simple_tag
def visible_inline(class_name, inline):
    if class_name != inline.__class__.__name__:
        return mark_safe('style="display:none"')