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:
https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey
EDIT:
As you stated in your comment, that you don't 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.
Django Documentation
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.
Since Django 2.0 the ForeignKey field requires two positional arguments:
categorie = models.ForeignKey('Categorie', on_delete=models.PROTECT)
Here are some methods can used in on_delete
Cascade deletes. Django emulates the behavior of the SQL constraint ON DELETE CASCADE and also deletes the object containing the ForeignKey
Prevent deletion of the referenced object by raising ProtectedError, a subclass of django.db.IntegrityError.
Take no action. If your database backend enforces referential integrity, this will cause an IntegrityError unless you manually add an SQL ON DELETE constraint to the database field.
you can find more about on_delete by reading the documentation.
If you are using foreignkey then you have to use "on_delete=models.CASCADE" as it will eliminate the complexity developed after deleting the original element from the parent table. As simple as that.
categorie = models.ForeignKey('Categorie', on_delete=models.CASCADE)
Here are available options if it helps anyone for on_delete
CASCADE, DO_NOTHING, PROTECT, SET, SET_DEFAULT, SET_NULL
Post Django version 1.9,
on_delete
became a required argument, i.e. from Django 2.0.
In older versions, it defaults to CASCADE.
So, if you want to replicate the functionality that you used in earlier versions. Use the following argument.
categorie = models.ForeignKey('Categorie', on_delete = models.CASCADE)
This will have the same effect as that was in earlier versions, without specifying it explicitly.
Official Documentation on other arguments that go with on_delete
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With