Migration Issues when updating model's default primary key from id to uuid

[Liuyang Wan]

Let's say in my Django project I have two models A and B.

class A(models.Model):
    something...

class B(models.Model):
    a = models.ForeignKey(A)

Later on I decided to use uuid as the primary key value. so I update the 
models:

import uuid

class A(models.Model):
     id = models.UUIDField(
         db_index=True,
         default=uuid.uuid4,
         editable=False
    )


class B(models.Model):
     id = models.UUIDField(
         db_index=True,
         default=uuid.uuid4,
         editable=False
    )

    a = models.ForeignKey(A)

Now if I make a migration, Django will NOT pick the changes with the 
foreign key, i.e the type of fk *B.a* needs to be updated to uuid as well, 
not integer anymore.

Is this a bug with current version of Django? What is the best practice for 
handling such case?

Thanks,
Liuyang


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