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The documentation says
For every field that has choices set, the object will have a get_FOO_display() method
but you don’t have any choices set for notification. In other words, you need a NOTIFICATION_CHOICES iterable of lenght two iterables in your class.
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notification = models.CharField(choices=provider_type, max_length=2, default='Em')
remove the arrayfield as it is not allowing you to create and iterate one
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