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When you use a ForeignKey you have to tell Django what model author_name is related to. Since its from another app it should look somehting like this.
author_name = models.ForeignKey('your_app_name.Modelname')
The app name is the other app you are taking the author from with the Model that the author is in.
https://docs.djangoproject.com/en/1.7/ref/models/fields/#foreignkey
Source:stackexchange.com