Django模型：删除字段 [英] Django Model: drop a field

问题描述

是否有直接简单的方法从Django模型中删除字段？对于添加字段，migration可以完美运行，但不能删除，抛出以下错误

Is there a straightforward clean way to drop a field from Django model? for addition of a field, migrate works perfect but its not working for deletion throwing the following error

django.db.utils.DatabaseError：（ 1060，重复的列名'xyz_json_old'）

django.db.utils.DatabaseError: (1060, "Duplicate column name 'xyz_json_old'")

推荐答案

我正在使用南方，但仍然我必须在朋友的帮助下进行以下操作-

I am using south but still I had to go through the following with the help of my friend -

他说我一定已经搞砸了，南部的一些内部步骤不是原子性的

He says I must have botched up something and some internal steps in south are not atomic

1. 编辑models.py文件并从类中删除列


2. BASH PROMPT $ python manage.py schemamigration core --auto


3. MYSQL PROMPT>更改表core_tablename放置列xyz_json_old;提交;


4. BASH PROMPT $ python manage.py core

1. edit the models.py file and delete the column from the class
2. BASH PROMPT$ python manage.py schemamigration core --auto
3. MYSQL PROMPT> alter table core_tablename drop column xyz_json_old; commit;
4. BASH PROMPT$ python manage.py core

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