如何在models.py文件中正确定义ManyToMany字段

时间:2013-06-24 14:20:26

标签: python django many-to-many models

在我的Django应用程序中,我有以下models.py:

from django.db import models
import datetime

class Job(models.Model):
    name = models.CharField(max_length = 250, null = False)
    user = models.CharField(max_length = 30, null = False)
    command = models.CharField(max_length = 1000, null = False)
    whenToRun = models.DateTimeField('Run Date', null = False)
    output = models.CharField(max_length = 100000, null = True)

class Host(models.Model):
    jobs = models.ManyToManyField(Job, blank = True)
    name = models.CharField(max_length = 100, null = False)
    hasRun = models.BooleanField(default = False)

我在https://docs.djangoproject.com/en/dev/topics/db/examples/many_to_many/的指导下在Host类中添加了作业分配。我能够毫无问题地添加主机(来自管理页面),但当我尝试添加作业时,我收到以下错误:

Exception at /admin/Minion/job/add
<class 'Minion.models.Host'> has no ForeignKey to <class 'Minion.models.Job'>

我尝试将ManyToManyField赋值添加到Job类,但它告诉我名称Host未定义。有谁知道我能做些什么来使这个领域正常运作?提前感谢您的帮助。

1 个答案:

答案 0 :(得分:1)

您需要在inlines

中为ManyToMany声明admin.py

检查the documentation如何声明内联

这样的事情:

class JobInline(admin.TabularInline):
     model = Host.jobs.through