Question

我有两种模式：

class Tickets(models.Model):
   ticketnumber = models.IntegerField()
   total_amount = models.DecimalField()

class TicketItems(models.Model):
   name = models.Charfield(max_length=30)
   ticket = models.ForeignKey(Tickets)
   price = models.DecimalField()
   amount = models.IntergerField()

我有一个内联管理页面，用户可以添加TicketItems。我该如何更新？保存所有TicketItems的模型门票总数（价格* 量）？

Django文档告诉我在admin.py中添加它：

class TicketAdmin(admin.ModelAdmin):
    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)
        for instance in instances:
            instance.user = request.user
            instance.save()
        formset.save_m2m()

我尝试了很多东西，但我无法更新总金额。这是我的admin.py：

class TicketitemsInline(admin.TabularInline):
    model = Ticketitems

class TicketsAdmin(admin.ModelAdmin):
    inlines = [
        TicketitemsInline,
    ]

    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)
        for instance in instances:
            instance.user = request.user
            instance.save()
            instance.update_total_amount()
        formset.save_m2m()
admin.site.register(Tickets, TicketsAdmin)

Answer 1

Pankaj Singh在Django邮件列表上回答了这个问题

以下是解决方案：我测试了以下代码并且它可以工作。

models.py

from django.db import models

class Ticket(models.Model):
    ticketnumber = models.IntegerField()
    total_amount = models.DecimalField(max_digits=7, decimal_places=2,
blank=True)

    def update_total_amount(self):
        total = 0
        for ti in self.ticketitem_set.all():
            total += ti.price * ti.amount
        self.total_amount = total
        self.save()

class TicketItem(models.Model):
    name = models.CharField(max_length=30)
    ticket = models.ForeignKey(Ticket)
    price = models.DecimalField(max_digits=7, decimal_places=2)
    amount = models.IntegerField()


#### admin.py
from django.contrib import admin
from tickets.models import Ticket, TicketItem


class TicketItemInline(admin.TabularInline):
    model = TicketItem

class TicketAdmin(admin.ModelAdmin):
    inlines = [TicketItemInline,]

    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)
        for instance in instances:
            instance.save()
        formset.save_m2m()
        instance.ticket.update_total_amount()


admin.site.register(Ticket, TicketAdmin)

在Django admin中更新父值

1 个答案: