django不修改数据库创外键_Django继续使用migrations命令为旧数据库重新创建外键字段...

我对Django开发还是个新手。我正在使用一个用MySQL创建的遗留数据库。现在我面临着Django迁移的问题。我很少有表使用外键来引用另一个表。现在，如果我允许Django管理那些带有外键的表，那么Django将尝试在make-migrations和migrate命令期间重新创建外键字段。即使田地已经在那里。此外，如果我不允许Django管理这些表，Django可以完美地处理数据库。

我的代码是针对表面对错误的from django.db import models

from django.utils.translation import gettext_lazy as _

from django.db.models.signals import pre_save

from chooseright.utils import unique_slug_generator

class StoreTable(models.Model):

store_id = models.AutoField(primary_key=True)

name = models.CharField(max_length=45, blank=True, null=True)

slug = models.SlugField(max_length=45, blank=True, null=True)

catagory = models.ForeignKey(CatagoryTable, on_delete=models.CASCADE, blank=True, null=True)

brand = models.ForeignKey(BrandTable, models.DO_NOTHING, blank=True, null=True)

class Meta:

managed = True

db_table = 'store_table'

verbose_name = _("Store")

verbose_name_plural = _("Stores")

def __str__(self):

return self.namefrom django.db import migrations, models

import django.db.models.deletion

class Migration(migrations.Migration):

dependencies = [

('core', '0009_auto_20200820_1258'),

]

operations = [

migrations.RenameField(

model_name='storetable',

old_name='store_name',

new_name='name',

),

migrations.AddField(

model_name='storetable',

name='brand',

field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.DO_NOTHING, to='core.BrandTable'),

),

migrations.AddField(

model_name='storetable',

name='catagory',

field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='core.CatagoryTable'),

),

]File "C:\Users\Usama\dev\Django Projects\lib\site-packages\MySQLdb\connections.py", line 259, in query

_mysql.connection.query(self, query)

django.db.utils.OperationalError: (1060, "Duplicate column name 'brand_id'")

现在我知道Django正在尝试重新创建外键字段。但既然是遗留数据库，我就不能理解为什么会发生这种情况。