How to reference id in model in new versions of django?

Question

Django

Just started learning Django.
For this piece of code, Django throws an error during migration.

class DescriptionLinks(models.Model):
    class Meta:
        db_table = "description_link"
    name = models.CharField(max_length = 100)
    description = models.TextField()

class SpecificLinks(models.Model):
    class Meta:
        db_table = "specific_link"
    link = models.SlugField(max_length = 200)
    description = models.ForeignKey(DescriptionLinks)

You are trying to add a non-nullable field 'project' to news 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)
2) Quit, and let me add a default in models.py
Select an option:
Found a similar problem and solution that added a mandatory the description field in the SpecificLinks model, but the DescriptionLinks object already exists and django doesn't know what to put in the description field.
There is also a code example in the doc:

def contact_default():
    return {"email": "[email protected]"}

contact_info = JSONField("ContactInfo", default=contact_default)

The question is why this is done, because in older versions, django referred to the id for the foreign key. And how to refer to id in new versions?

Answer 1

Add the following to the project field: null=True, blank=True
Or after migrating, select 1, and then specify 1 too :)

Answer 2

class Meta:
        db_table = "....."

It's redundant in the models. Specifically db_table.

Answer 3

You can press 1. You will be prompted to fill in an existing table with data
.