如何在models.py文件中正确定义ManyToMany字段 [英] how to properly define a ManyToMany field in the models.py file

问题描述

在我的Django应用程序中，我有以下models.py：

In my Django app I have the following 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)

我在主机类中添加了作业分配，其中包括 https：/ /docs.djangoproject.com/en/dev/topics/db/examples/many_to_many/ 。我可以添加主机没有问题（从管理页面），但是当我尝试添加一个工作我得到以下错误：

I added the jobs assignment in the Host class with guidance from https://docs.djangoproject.com/en/dev/topics/db/examples/many_to_many/. I was able to add Hosts in with no problem (from the admin page) but when I tried to add in a Job I got the following error:

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

我尝试添加一个ManyToManyField作业到Job类，但它告诉我，名称主机没有定义。有人知道我可以做什么来使这个领域正常工作吗？感谢您提前获得任何帮助。

I tried to add a ManyToManyField assignment to the Job class as well but it told me that the name Host was undefined. Does anyone know what I can do to make this field function properly? Thanks in advance for any help.

推荐答案

您需要声明 inlines 在 ManyToMany 在 admin.py

检查文档申报内容

这样的东西：

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

这篇关于如何在models.py文件中正确定义ManyToMany字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！