django throws error: Invalid column name 'id' (SQL SERVER) - django

Question

I try to create a web app using django and connecting to a SQL Server Database. The table that I use to display the data in a django form consists of 2 columns. Both of them being a foreign key and both of them together building the primary key of the table
CREATE TABLE [dbo].[MyTable]( [ID_Field1] [int] NOT NULL,
[ID_Field2] [int] NOT NULL, CONSTRAINT [PK_Movies2Genres] PRIMARY
KEY CLUSTERED ( [ID_Field1] ASC, [ID_Field2] ASC )WITH (PAD_INDEX =
OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON
[PRIMARY]
ALTER TABLE [dbo].[MyTable] WITH CHECK ADD CONSTRAINT [FK_Field2]
FOREIGN KEY([ID_Field2]) REFERENCES [dbo].[Table2] ([ID_Field2])
ALTER TABLE [dbo].[MyTable] CHECK CONSTRAINT [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] CHECK CONSTRAINT [FK_Field1]
Now, django apperantly cannot create a model corresponding to this kind of sql table structure, i.e. it cannot create a primary key consisting of more than one field. Instead, it sets the primary key on one of the 2 columns and in the meta section of the model class it sets
unique_together = (('id_field1', 'id_field2'),)
The complete model:
class 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'),)
However, this is what django inspectdb tells me to do. I know that django creates automatically a field called id when there is no primary key defined. This seems to be the case here, although there is a primary key defined. Any idea how to deal with that problem?

Answer 1

use: 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"
})