Setting default value for Foreign Key attribute

Question

What is the best way to set a default value for a foreign key field in a model? Suppose I have two models, Student and Exam with student having

Answer 1

You could use this pattern:

class Other(models.Model):
    DEFAULT_PK=1
    name=models.CharField(max_length=1024)

class FooModel(models.Model):
    other=models.ForeignKey(Other, default=Other.DEFAULT_PK)

Of course you need to be sure that there is a row in the table of Other. You should use a datamigration to be sure it exists.