[Django]-Django model.foreignKey and return self.text errors

by

7👍

✅

The problem was ForeignKey in Django 1.9 required 1 positional argument in Django 2.0 ForeignKey 2 required positional argument

  topic = models.ForeignKey("Topic", on_delete=models.PROTECT)
👤mayhemds

0👍

The reason of second issue is you missed the command after the command python manage.py makemigrations [appname], the missing command is python manage.py migrate.

👤Gavin.Hall

0👍

To prevent this, we should use on_delete=models.PROTECT.

By default Django uses on_delete=models.CASCADE but this is not secure if object deleted accidentally.

In that case there would be no notification of deleted objects so it would be ideal to use models.PROTECT.

👤user10678889

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