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

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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