[首先,我创建了一个名为'userorders
'的模型,它具有以下字段:id
(默认情况下),user_id
和order_id
。
然后意识到我不需要order_id
之后,我首先从MySQL DB中删除了它(使用Workbench),然后我在Django中对模型进行了更改,但现在一直显示错误。
0013_orderdetails_userorders.py
migrations.CreateModel(
name='userorders',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('user_id', models.IntegerField()),
('order_id', models.IntegerField()),
],
),
0014_remove_userorders_order_id.py
dependencies = [
('shoppingCart', '0013_orderdetails_userorders'),
]
operations = [
migrations.RemoveField(
model_name='userorders',
name='order_id',
),
]
0015_userorders_order_id.py
dependencies = [
('shoppingCart', '0014_remove_userorders_order_id'),
]
operations = [
migrations.AddField(
model_name='userorders',
name='order_id',
field=models.IntegerField(default=None),
preserve_default=False,
),
0016_remove_userorders_order_id.py
dependencies = [
('shoppingCart', '0015_userorders_order_id'),
]
operations = [
migrations.RemoveField(
model_name='userorders',
name='order_id',
),
]
0017_auto_20200508_1639.py
dependencies = [
('shoppingCart', '0016_remove_userorders_order_id'),
]
operations = [
migrations.RenameField(
model_name='orderdetails',
old_name='user_id',
new_name='order_id',
),
]
ERRORS-当我尝试迁移所做的任何更改时(更改未反映在数据库中)
MySQLdb._exceptions.OperationalError: (1091, "Can't DROP 'order_id'; check that column/key exists")
The above exception was the direct cause of the following exception:
django.db.utils.OperationalError: (1091, "Can't DROP 'order_id'; check that column/key exists")
当前,userorders
包含2个字段-id
和user_id
我该如何解决?
问题是您的工作流程应该删除该字段,进行迁移并将迁移应用到您的数据库。
但是由于您现在遇到了问题,您可以通过在表中(使用工作台)重新创建列order_id
来解决此问题,然后执行makemigrations
&migrate
,然后django可以删除该列并且不应t显示错误。