update the ForeignKey field for Django 2.0 #42
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ForeignKey is a Django field for defining a many-to-one relationship.
Up until Django 1.9 the ForeignKey field required a single argument: the model to map to.
Since Django 2.0 the ForeignKey field requires two positional arguments:
If without the second argument, error message shows:
You can find more about on_delete by reading the documentation.
Reference: https://www.valentinog.com/blog/django-missing-argument-on-delete/