Django迁移列与引用列不同
我有以下模型,该模型是现有的DB模型,并通过Django的InspectDB管理命令创建了以下模型。
class ExistingLegacyModel(models.Model):
period = models.TextField(db_column="Period", blank=True, null=True)
key = models.AutoField(db_column="OutlookKey", primary_key=True)
class Meta:
managed = False
db_table = "table_name"
目前,我正在尝试使用现有旧版数据库模型的字段外键引用一个模型,
class TestModel(models.Model):
period = models.ForeignKey(
ExistingLegacyModel,
on_delete=models.CASCADE,
db_column="OutlookKey",
)
因此当我运行makemigrations命令时,迁移文件将成功创建而没有问题。以下是迁移文件内容。
class Migration(migrations.Migration):
initial = True
dependencies = [
('historical', '0011_phoenixcontractprice'),
]
operations = [
migrations.CreateModel(
name='TestModel',
fields=[
('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('period', models.ForeignKey(db_column='OutlookKey', on_delete=django.db.models.deletion.CASCADE, to='app.ExistingLegacyModel')),
],
),
]
因此,现在当我现在运行迁移命令时,它正在失败并给出以下错误。
django.db.utils.ProgrammingError: ('42000', "[42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Column 'table_name.OutlookKey' is not the same data type as referencing column 'version_testmodel.OutlookKey' in foreign key 'version_testmodel_OutlookKey_eb16c31c_fk_table_name_OutlookKey'. (1778) (SQLExecDirectW); [42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Could not create constraint or index. See previous errors. (1750)")
在过去的几天里,我遇到了这个问题,我在互联网上进行了搜索,但没有任何解决方案。我发现了几个与我的问题非常相似的stackoverflow问题,但是这些问题也没有解决。
目前,我正在使用Django 3.2.13和MSSQL-DJANGO连接到MSSQL数据库。
对此的任何帮助将不胜感激!先感谢您。
更新1
我运行了SQLMigrate命令以进行初始迁移。因此,对于周期列,它使用Big Int [OutlookKey] Bigint而不是Null
创建表格,而现有旧模型则具有正常的整数字段。
ALTER TABLE [<app>_<model>] ADD CONSTRAINT [<app>_<model>_OutlookKey_3505d410_fk_<existing_legacy_table>_OutlookKey] FOREIGN KEY ([OutlookKey]) REFERENCES [<existing_legacy_table>] ([OutlookKey]);
I have the below model which is an existing DB model and through Django's inspectdb management command the below model is created.
class ExistingLegacyModel(models.Model):
period = models.TextField(db_column="Period", blank=True, null=True)
key = models.AutoField(db_column="OutlookKey", primary_key=True)
class Meta:
managed = False
db_table = "table_name"
and currently, I'm trying to create a model with a field foreign key reference to the existing legacy DB model
class TestModel(models.Model):
period = models.ForeignKey(
ExistingLegacyModel,
on_delete=models.CASCADE,
db_column="OutlookKey",
)
so when I run the makemigrations command the migration file is successfully getting created with no issue. below is the migration file content.
class Migration(migrations.Migration):
initial = True
dependencies = [
('historical', '0011_phoenixcontractprice'),
]
operations = [
migrations.CreateModel(
name='TestModel',
fields=[
('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('period', models.ForeignKey(db_column='OutlookKey', on_delete=django.db.models.deletion.CASCADE, to='app.ExistingLegacyModel')),
],
),
]
so now when i run the migrate command now, it is failing and giving the below error.
django.db.utils.ProgrammingError: ('42000', "[42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Column 'table_name.OutlookKey' is not the same data type as referencing column 'version_testmodel.OutlookKey' in foreign key 'version_testmodel_OutlookKey_eb16c31c_fk_table_name_OutlookKey'. (1778) (SQLExecDirectW); [42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Could not create constraint or index. See previous errors. (1750)")
I'm stuck with this issue for the past couple of days and I searched all over the internet but didn't get any resolution. I found a couple of StackOverflow questions that are very similar to my issue, but those questions are also unanswered.
- Django - Migration foreign key field type not matching current type
- Django 3.2 update AutoField to BigAutoField backward compatibility with foreign key relations
I'm currently using Django 3.2.13 and mssql-django to connect to the MSSQL database.
Any help on this will be highly appreciated! Thank you in advance.
UPDATE 1
I ran the sqlmigrate command for the initial migration. So for the period column, it is creating the table with a foreign key field with big int [OutlookKey] bigint NOT NULL
whereas the existing legacy model has a normal integer field.
ALTER TABLE [<app>_<model>] ADD CONSTRAINT [<app>_<model>_OutlookKey_3505d410_fk_<existing_legacy_table>_OutlookKey] FOREIGN KEY ([OutlookKey]) REFERENCES [<existing_legacy_table>] ([OutlookKey]);
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