Makemigrations fails when using lambda as default for ForeignKey field

[Rik]

When using a lambda function as a default value for a ForeignKey field, makemigrations will fail with the exception:

ValueError: Cannot serialize function: lambda

This is the code:

from django.db import models

class House(models.Model):

address = models.CharField(max_length=100)

class Person(models.Model):

house = models.ForeignKey(House, default=lambda: House.objects.all()[0])
name = models.CharField(max_length=100)

I tried to change the lambda to a defined function like this:

from django.db import models

class House(models.Model):

address = models.CharField(max_length=100)

def first_house():

House.objects.all()[0]

class Person(models.Model):

house = models.ForeignKey(House, default=first_house)
name = models.CharField(max_length=100)

In this case, makemigrations works, but migrate will now fail, with the exception:

TypeError: int() argument must be a string or a number, not 'House'

I'm testing this in Python 3 btw.