django 抛出错误：无效的列名 'id' (SQL SERVER)

Question

我尝试使用 django 创建一个 Web 应用程序并连接到 SQL Server 数据库。我用来以 django 形式显示数据的表由 2 列组成。它们都是外键，它们共同构建表的主键

创建表 [dbo].[MyTable]( [ID_Field1] [int] NOT NULL, [ID_Field2] [int] 非空，约束 [PK_Movies2Genres] PRIMARY 键集群（[ID_Field1] ASC，[ID_Field2] ASC）与（PAD_INDEX = 关闭，STATISTICS_NORECOMPUTE = 关闭，IGNORE_DUP_KEY = 关闭， ALLOW_ROW_LOCKS = ON，ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [主要]

ALTER TABLE [dbo].[MyTable] WITH CHECK ADD CONSTRAINT [FK_Field2] FOREIGN KEY([ID_Field2]) REFERENCES [dbo].[Table2] ([ID_Field2])

ALTER TABLE [dbo].[MyTable] 检查约束 [FK_Field2]

ALTER TABLE [dbo].[MyTable] WITH CHECK ADD CONSTRAINT [FK_Field1] FOREIGN KEY([ID_Field1]) REFERENCES [dbo].[Table1] ([ID_Movie])

ALTER TABLE [dbo].[MyTable] 检查约束 [FK_Field1]

现在，django 显然无法创建与这种 sql 表结构对应的模型，即它无法创建包含多个字段的主键。相反，它在 2 列之一和它设置的模型类的元部分中设置主键

unique_together = (('id_field1', 'id_field2'),)

完整模型：

类 MyTable(models.Model)：

id_field1 = models.ForeignKey(Table1, on_delete=models.DO_NOTHING, db_column='ID_Field1') 
id_field2 = models.ForeignKey(Table2, on_delete=models.DO_NOTHING, db_column='ID_Field2')

class Meta:
    managed = False
    db_table = 'MyTable'
    unique_together = (('id_field1', 'id_field2'),)

但是，这是 django inspectdb 告诉我的。我知道当没有定义主键时，django 会自动创建一个名为 id 的字段。尽管定义了主键，但这里似乎就是这种情况。知道如何处理这个问题吗？

Answer 1

使用：https://github.com/onysos/django-composite-foreignkey

class Customer(models.Model):

    company = models.IntegerField()
    customer_id = models.IntegerField()
    name = models.CharField(max_length=255)
    address = CompositeForeignKey(Address, on_delete=CASCADE, to_fields={
        "tiers_id": "customer_id",
        "company": LocalFieldValue("company"),
        "type_tiers": RawFieldValue("C")
    })

    class Meta(object):
        unique_together = [
            ("company", "customer_id"),
        ]


class Contact(models.Model):
    company_code = models.IntegerField()
    customer_code = models.IntegerField()
    surname = models.CharField(max_length=255)
    # virtual field
    customer = CompositeForeignKey(Customer, on_delete=CASCADE, related_name='contacts', to_fields={
        "customer_id": "customer_code",
        "company": "company_code"
    })