Django的选择.如何设置默认选项？

Question

如何设置默认STATUSES选项？

class Order(models.Model):
    STATUSES = (
        (u'E', u'Expected'),
        (u'S', u'Sent'),
        (u'F', u'Finished'),
    )

    status = models.CharField(max_length=2, null=True, choices=STATUSES)

Answer 1

status = models.CharField(max_length=2, null=True, choices=STATUSES, default='E')

或者,如果STATUSES发生变化,则避免设置无效的默认值:

status = models.CharField(max_length=2, null=True, choices=STATUSES, default=STATUSES[0][0])

Answer 2

这是一个老问题，只是想添加现在可用的 Djanto 3.x+ 语法：

class StatusChoice(models.TextChoices):
    EXPECTED = u'E', 'Expected'
    SENT = u'S', 'Sent'
    FINISHED = u'F', 'Finished'

然后，您可以使用此语法来设置默认值：

status = models.CharField(
    max_length=2,
    null=True,
    choices=StatusChoice.choices,
    default=StatusChoice.EXPECTED
)