Hi all,
I'm trying to create migration with uniqueness of 2 fields: uid, source.
*Django 2.2.9*
class Users(models.Model):
uid = models.CharField(...)
source = models.ForeignKey(*...*)
class Meta:
constraints = [models.UniqueConstraint(fields=['uid', 'source'],
name='users_uniqueness')]
indexes = [models.Index(fields=('uid', 'source'), name='users_indexes')]
When I start makemigrations command in manage.py it rises *fields.E310
<https://docs.djangoproject.com/en/2.2/ref/checks/#related-fields>* error
app_name.Users.field: (fields.E310) No subset of the fields 'uid', 'source' on
model 'Users' is unique.
HINT: Add unique=True on any of those fields or add at least a subset
of them to a unique_together constraint.
When I change Meta options to unique_together constraint it works ok.
Migrations passes with no errors
...
class Meta:
unique_together = [['uid', 'source']]
As mentioned in docs
<https://docs.djangoproject.com/en/2.2/ref/models/options/#unique-together>
unique_together may be deprecated in the future so I wanted to avoid this kind
of issue.
*Thanks,*
*Pavel*
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