使用枚举作为选择来获取选择显示值 [英] Get choices display value using enum as choices

问题描述

我有一个Django模型，其中使用了choices参数.对于选择，我使用的是Python枚举.现在，我想在模板中显示选择显示值.我知道有 .get_fieldname_display ，但是在这种情况下，它只是返回键而不是显示值.

I have a Django model in which I'm using the choices parameter. For the choices, I'm using a Python Enum. Now I want to display the choices display value in a template. I know there's .get_fieldname_display but it just returns the key instead of the display value in this case.

型号:

class LocalTitle(models.Model):
    type = models.CharField(max_length=8, choices=[(tag, tag.value) for tag in LocalTitleCodes])
    title = models.CharField(max_length=255)

枚举:

class LocalTitleCodes(Enum):
     title_00 = 'Japanese'
     title_01 = 'English'
     title_02 = 'French'

因此，在我的情况下，如果我在模板中执行 title.get_type_display ，它将返回 title_00 而不是 Japanese .如何获得显示值?

So in my case, if I do title.get_type_display in my template it returns title_00 and not Japanese. How can I get the display value?

推荐答案

我认为问题更多是 tag 不会 not 映射到 title__00 ，但是是 LocalTitleCodes 对象.

I think the problem is more that tag does not map to title__00, but to a LocalTitleCodes object.

您应该使用:

class LocalTitle(models.Model):
    type = models.CharField(
        max_length=8,
        choices=[(tag.name, tag.value) for tag in LocalTitleCodes]
    )
    title = models.CharField(max_length=255)

由于Django无法找到相应的值，因此它回退到存储在数据库中的值.

Since Django thus could not find a the corresponding value, it fallsback on the value stored in the database.

因为:

>>> [(tag, tag.value) for tag in LocalTitleCodes]
[(<LocalTitleCodes.title_00: 'Japanese'>, 'Japanese'), (<LocalTitleCodes.title_01: 'English'>, 'English'), (<LocalTitleCodes.title_02: 'French'>, 'French')]
>>> [(tag.name, tag.value) for tag in LocalTitleCodes]
[('title_00', 'Japanese'), ('title_01', 'English'), ('title_02', 'French')]

这篇关于使用枚举作为选择来获取选择显示值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！