Hi everyone,
Vital stats: MySQL, python 3.5, Ubuntu, not using South.
I'm upgrading from 1.9.5 to 1.11.8, and in amongst that there is a
migration to change to username field length in auth:
auth
[X] 0001_initial
[X] 0002_alter_permission_name_max_length
[X] 0003_alter_user_email_max_length
[X] 0004_alter_user_username_opts
[X] 0005_alter_user_last_login_null
[X] 0006_require_contenttypes_0002
[X] 0007_alter_validators_add_error_messages
[ ] 0008_alter_user_username_max_length
That migration fails with the following message:
django.db.utils.IntegrityError: (1452, 'Cannot add or update a child row: a
foreign key constraint fails (`tenant_fibrhealth`.`#sql-492_450`,
CONSTRAINT `biomarker_range_user_id_ad579e08_fk` FOREIGN KEY (`user_id`)
REFERENCES `auth_user` (`id`))')
Here is the model:
class Range(models.Model):
user = models.ForeignKey(User, blank=True, null=True,
related_name='ranges')
>From my understanding this is happening because you can't change the length
of a field used as a foreign key in MySQL
(see
https://stackoverflow.com/questions/36386231/how-to-change-the-size-of-a-column-with-foreign-key-constraint)
That post suggests the foreign keys need to be deletes and added back in.
I'm not sure I like the idea of deleting all my foreign keys against
user_id (there are quite a few tables with this) and I'm also not sure
where I would do this, given that the migration file is not mine, but
belongs to Django's auth app.
Now surely I'm not the only person using MySQL who's come across this?
Any ideas?
Thanks,
Andrew.
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