#22435: Adding a ManyToManyField and running makemigrations prompts for a
default
-------------------------------+--------------------
Reporter: andrewsg | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Adding a ManyToManyField to an existing model prompts the user as so:
{{{
You are trying to add a non-nullable field 'authors' to post without a
default;
we can't do that (the database needs something to populate existing rows).
Please select a fix:
1) Provide a one-off default now (will be set on all existing rows)
2) Quit, and let me add a default in models.py
Select an option:
}}}
Since there is no way to specify a default for an M2M field in the
interactive process, this makes it impossible to add M2M fields.
The workaround is to cancel and add `null=True` to the field definition.
But `null=True` does not apply to `ManyToManyField`, so this should be
unnecessary.
--
Ticket URL: <https://code.djangoproject.com/ticket/22435>
Django <https://code.djangoproject.com/>
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