django-admin - 如何从 django modelAdmin 中的 save_related 表单集中访问所有表单

Question

当调用 save_related 时，我需要访问内联表单集中所有表单的两个字段，并且save_related 让我只能访问更改后的表单/数据。

我的问题的任何其他解决方案都可以，所以这里是:

class Invoice(models.Model):
    invoice = models.CharField(max_length=10, blank=True, null=True, unique=True)
    total = models.PositiveIntegerField(blank=True, null=True)


class InvoiceItem(models.Model):
    invoice = models.ForeignKey(Invoice, related_name='items')
    service = models.ForeignKey(Service)
    quantity = models.PositiveIntegerField(blank=False, default=1)
    price = models.PositiveIntegerField(blank=False, default=0)


class InvoiceItemInline(admin.TabularInline):
    model = InvoiceItem


class InvoiceAdmin(admin.ModelAdmin):
    inlines = [InvoiceItemInline]

    def save_related(self, request, form, formsets, change):
        invoice = form.instance
        invoice.total = 0
        for inlines in formsets:
            for inline_form in inlines:
                invoice.total = invoice.total + inline_form.cleaned_data['price'] * inline_form.cleaned_data['quantity']
        invoice.save()
        super(InvoiceAdmin, self).save_related(request, form, formsets, change)

我需要计算每个发票项目的发票总额，其中每个项目都有数量 * 价格。

Answer 1

我找不到解决方案，所以我保存了相关数据并使用查询集来获取保存的数据，以便我可以进行计算并再次保存。我想有人会称之为“一种解决方法”:)

def save_related(self, request, form, formsets, change):
    super(InvoiceAdmin, self).save_related(request, form, formsets, change)
    invoice = form.instance
    invoice.total = 0
    for item in Invoice.objects.get(pk=invoice.id).items.all():
        invoice.total = invoice.total + item.quantity * item.price
    invoice.save()