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

the best way I know is to use lambdas

class TblSearchCase(models.Model):
    weights = models.ForeignKey('TblSearchWeights', models.DO_NOTHING, default=lambda: TblSearchWeights.objects.get(weight_name='value_you_want'))

so you can specify the default row..

default=lambda: TblSearchWeights.objects.get(weight_name='value_you_want')