#34151: Adding explicit primary key with different type doesn't update related
ManyToManyFields.
-------------------------------------+-------------------------------------
Reporter: STANISLAV LEPEKHOV | Owner: Bhuvnesh
Type: Bug | Status: assigned
Component: Migrations | Version: 4.1
Severity: Normal | Resolution:
Keywords: migrations pk uuid | Triage Stage: Accepted
relation |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Bhuvnesh):
The migration generated for this contains removing the old pk and adding
new pk :
{{{
class Migration(migrations.Migration):
dependencies = [
("ticket_34151", "0001_initial"),
]
operations = [
migrations.RemoveField(
model_name="place",
name="id",
),
migrations.RemoveField(
model_name="storechain",
name="id",
),
migrations.AddField(
model_name="place",
name="uid",
field=models.UUIDField(
default=uuid.uuid4,
editable=False,
primary_key=True,
serialize=False,
unique=True,
),
),
migrations.AddField(
model_name="storechain",
name="uid",
field=models.UUIDField(
default=uuid.uuid4,
editable=False,
primary_key=True,
serialize=False,
unique=True,
),
),
]
}}}
but on some databases (mysql, postgres) we cannot delete a pk of a model
which is referenced by other.
I tried to implement a
solution([https://github.com/django/django/pull/16325 draft PR] ) which is
working fine for sqlite3 but throws the following error on some dbs
(mysql, postgres) during the RemoveField operation:
{{{
(1829, "Cannot drop column 'id': needed in a foreign key constraint
'ticket_34151_storech_placespk_id_ca7ce831_fk_ticket_34' of table
'ticket_34151_storechain'")
}}}
This made me think if it is really possible to add a new pk to a
referenced model for dbs like mysql and postgres?
--
Ticket URL: <https://code.djangoproject.com/ticket/34151#comment:10>
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