[Python] How can one use enums as a choice field in a Django model?

I have a model class in which I want two fields to be choice fields, so to populate those choices I am using an enum as listed below:

#models.py
class Transaction(models.Model):
transaction_status = models.CharField(max_length=255, choices=TransactionStatus.choices())
transaction_type = models.CharField(max_length=255, choices=TransactionType.choices())

#enums.py
class TransactionType(Enum):

IN = "IN",
OUT = "OUT"

@classmethod
def choices(cls):
print(tuple((i.name, i.value) for i in cls))
return tuple((i.name, i.value) for i in cls)

class TransactionStatus(Enum):

INITIATED = "INITIATED",
PENDING = "PENDING",
COMPLETED = "COMPLETED",
FAILED = "FAILED"
ERROR = "ERROR"

@classmethod
def choices(cls):
print(tuple((i.name, i.value) for i in cls))
return tuple((i.name, i.value) for i in cls)


However, when I am trying to access this model through the Django Admin I am getting the following error:

Django Version: 1.11
Exception Type: ValueError
Exception Value:
too many values to unpack (expected 2)


I followed two articles that described how to use enums:

• https://hackernoon.com/using-enum-as-model-field-choice-in-django-92d8b97aaa63
• https://blog.richard.do/2014/02/18/how-to-use-enums-for-django-field-choices/

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