Set `prepopulated_fields` to a dictionary mapping field names to the fields it should prepopulate from:

```py
class ArticleAdmin(admin.ModelAdmin):
    prepopulated_fields = {"slug": ["title",]}
```

> `prepopulated_fields` doesn’t accept `DateTimeField`, `ForeignKey`, `OneToOneField`, and `ManyToManyField` fields.

---

[Source](https://docs.djangoproject.com/en/3.0/ref/contrib/admin/)

Pre-populate fields' text based on the content of another field in Django admin

Pre-populate fields in Django admin

Django, Python