python – Getting TypeError: __init__() missing 1 required positional argument: on_delete when trying to add parent table after child table with entries

python – Getting TypeError: init() missing 1 required positional argument: on_delete when trying to add parent table after child table with entries

You can change the property categorie of the class Article like this:

categorie = models.ForeignKey(
    Categorie,
    on_delete=models.CASCADE,
)

and the error should disappear.

Eventually you might need another option for on_delete, check the documentation for more details:

EDIT:

As you stated in your comment, that you dont have any special requirements for on_delete, you could use the option DO_NOTHING:

# ...
on_delete=models.DO_NOTHING,
# ...

Since Django 2.x, on_delete is required.

Deprecated since version 1.9: on_delete will become a required
argument in Django 2.0. In older versions it defaults to CASCADE.

From Django 2.0 on_delete is required:

user = models.OneToOneField(User, on_delete=models.CASCADE)

It will delete the child table data if the User is deleted. For more details check the Django documentation.