回答问题

我有一个模型类,我希望其中两个字段作为选择字段,因此要填充这些选择,我使用了下面列出的枚举

#models.py
class Transaction(models.Model):
    trasaction_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)

但是,当我尝试通过管理员访问此模型时,我收到以下错误:

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

我关注了两篇描述如何使用枚举的文章:

• 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/

Answers

您的代码中的问题是INITIATED = "INITIATED",在INITIATED选项和其他选项之后的逗号。当我们在任何字符串后添加逗号时,它将成为一个元组。请参阅下面的示例

s = 'my str'
print(type(s))
# output: str

s = 'my str',
print(type(s))
# output: tuple

#models.py

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

#枚举.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)

对于 django > 3.0https://docs.djangoproject.com/en/4.0/ref/models/fields/#field-choices-enum-types