Model using inheritance: You are trying to add a non-nullable field 'id' to typemod without a default;

Question

I am using model inheritance in my models.py. This is my code:

class Email(models.Model):
    stuff = models.CharField(max_length=40, blank=True,
                             null=True, default="")
class TypeMod(Email):
    pass

When I run makemigrations, I get the following message although I have set the default value for all of my fields in the Email model:

You are trying to add a non-nullable field 'id' to typemod without a 
default; we can't do that (the database needs something to populate 
existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows 
with a null value for this column)
 2) Quit, and let me add a default in models.py

What am I doing wrong?!

nerez nerez · Accepted Answer · 2018-02-07T04:31:32

It doesn't necessarily have to do with vagrant. I used a native Linux machine and got the same message. My solution was to remove the existing migrations.

Model using inheritance: You are trying to add a non-nullable field 'id' to typemod without a default;

2 Answers