将ManyToManyField字段添加到现有模型 [英] Adding a ManyToManyField field to an existing model

问题描述

我有一个生产模型，我需要添加以下字段：

  tag = models.ManyToManyField ）
  

以下内容不会改变：

  python manage.py syncdb 
  

因此， mymodel_tag表未被创建。我正在使用Postgres。

除了删除表格并重新创建它，因为应用程序已经在生产中使用，我有什么选择。

解决方案

南肯定会帮助： p>

South是为Django应用程序提供一致，易于使用和数据库无关迁移的工具。

注意，在Django 1.7（目前处于开发阶段），South将成为django的一部分（ docs ）。

开始的好地方是通过<一个href =http://south.readthedocs.org/en/latest/tutorial/index.html =nofollow noreferrer>教程和如何开始使用南与exi sting数据库页面。

另见：

• Django - syncdb不创建表


• < a href =https://code.djangoproject.com/ticket/2229 =nofollow noreferrer> django-admin的syncdb不检查是否丢失了多对多表


• django添加一个ManyToMany字段/表到现有模式，related_name错误

请注意，手动创建多对多表可能会像一个简单的解决方案/解决方案在短视角，但我会考虑转向南无论如何。

希望有帮助。

I have a production model and I need to add the following field to it:

tag = models.ManyToManyField(Tags)

The following is not picking up the change:

python manage.py syncdb

And therefore, mymodel_tag table is not being created. I am using Postgres.

What are my options other than dropping the table and recreating it since the application is already on production use.

解决方案

South would definitely help:

South is a tool to provide consistent, easy-to-use and database-agnostic migrations for Django applications.

Note that in Django 1.7 (currently in development stage) South is going to become a part of django (docs).

A good place to start is to go through the tutorial and how to start using South with an existing database page.

Also see:

• Django - syncdb doesn't create tables
• django-admin's syncdb does not check for missing many-to-many tables
• django adding a ManyToMany field/table to existing schema, related_name error

Note that creating a many-to-many table manually may look like an easy solution/workaround in a short-perspective, but I'd consider switching to south anyway.

Hope that helps.

这篇关于将ManyToManyField字段添加到现有模型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！