“管理”面板中的ManytoMany字段的Lis​​t_display

Question

我有2个应用：Visitors和Meetings，通过ManytoMany字段链接：

访问者/ models.py：

from django.db import models
from meetings.models import Meeting

class Visitor(models.Model):

    visitor_name = models.CharField(default='name', max_length=128, blank=False, null=False)
    visitor_meetings = models.ManyToManyField(Meeting)

    def __str__(self):
        return self.visitor_name

会议/ models.py：

from django.db import models
from team.models import Team

class Meeting(models.Model):
    team_member = models.ForeignKey(Team)
    meeting_name = models.CharField(default='name', max_length=128, blank=True, null=True)

    def __str__(self):
        return self.meeting_name

我知道在list_display管理面板中获取Visitors会议的正确方法是：https://stackoverflow.com/a/18108586/2429989。

但是，如何在 list_display 管理面板中为每次会议的访问者显示Meetings？我试过了：

会议/ admin.py：

from django.contrib import admin
from .models import Meeting
from visitors.models import Visitor

class MeetingAdmin(admin.ModelAdmin):
    list_display = ['id', 'team_member', 'show_visitors' ]

    def show_visitors(self, obj):
        return "\n".join([a.visitor_name for a in obj.visitor.all()])

admin.site.register(Meeting, MeetingAdmin)

这导致'Meeting' object has no attribute 'visitor'，我哪里错了？

Answer 1

默认的反向查询关系始终为obj.tablename_set。在您的情况下，您需要使用class ApplicationMailer < ActionMailer::Base default from: 'hello@myapp.com' layout 'mailer' ADMIN_EMAIL = 'admin@myapp.com' end class AdminMailer < ApplicationMailer default to: "#{ADMIN_EMAIL}" def mandrill_client @mandrill_client ||= Mandrill::API.new MANDRILL_API_KEY end def new_user(user) #set required params mandrill_client.messages.send_template template_name, template_content, message end end

obj.visitor_set.all()

但是，您可以通过定义related_name：

来自定义反向查找的名称

class MeetingAdmin(admin.ModelAdmin):
    list_display = ['id', 'team_member', 'show_visitors' ]

    def show_visitors(self, obj):
        return "\n".join([a.visitor_name for a in obj.visitor_set.all()])

所有class Visitor(models.Model): visitor_name = models.CharField(default='name', max_length=128, blank=False, null=False) visitor_meetings = models.ManyToManyField(Meeting, related_name='visitors') def __str__(self): return self.visitor_name 个对象现在都可以访问Meeting。使用它像：

visitors