设置Django IntegerField的选择= ...名称

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问题描述

当您有一个包含选项选项的模型字段时，您往往会有一些与人类可读名称相关联的魔术值。 Django有没有一个方便的方法来设置这些字段的人的可读名称而不是值？

考虑这个模型：

pre>

 class Thing（models.Model）：
 PRIORITIES =（
（0，'Low'），
（1，'Normal '），
（2，'High'），
）
 
 priority = models.IntegerField（默认= 0，选择= PRIORITIES）

在某些时候，我们有一个Thing实例，我们要设置它的优先级。显然你可以做，

  thing.priority = 1

但是这会迫使你记住优先权的Value-Name映射。这不起作用：

  thing.priority ='Normal'＃在.save（）上抛出ValueError

目前我有这个愚蠢的解决方法：

 code> thing.priority = dict（（key，value）for（value，key）in Thing.PRIORITIES）['Normal']

但这很笨重。鉴于这种情况可能是多么常见，我想知道是否有人有更好的解决方案。有没有一些字段方法用于通过选择名称设置字段，我完全忽视了

解决方案

做为。那么你可以使用一个代表正确整数的单词。

像这样：

  LOW = 0 
 NORMAL = 1 
 HIGH = 2 
 STATUS_CHOICES =（
（LOW，'Low'），
（NORMAL，'Normal' ），
（HIGH，'High'），
）

然后他们在DB中仍然是整数。

使用将是 thing.priority = Thing.NORMAL

When you have a model field with a choices option you tend to have some magic values associated with human readable names. Is there in Django a convenient way to set these fields by the human readable name instead of the value?

Consider this model:

class Thing(models.Model):
  PRIORITIES = (
    (0, 'Low'),
    (1, 'Normal'),
    (2, 'High'),
  )

  priority = models.IntegerField(default=0, choices=PRIORITIES)

At some point we have a Thing instance and we want to set its priority. Obviously you could do,

thing.priority = 1

But that forces you to memorize the Value-Name mapping of PRIORITIES. This doesn't work:

thing.priority = 'Normal' # Throws ValueError on .save()

Currently I have this silly workaround:

thing.priority = dict((key,value) for (value,key) in Thing.PRIORITIES)['Normal']

but that's clunky. Given how common this scenario could be I was wondering if anyone had a better solution. Is there some field method for setting fields by choice name which I totally overlooked?

解决方案

Do as seen here. Then you can use a word that represents the proper integer.

Like so:

LOW = 0
NORMAL = 1
HIGH = 2
STATUS_CHOICES = (
    (LOW, 'Low'),
    (NORMAL, 'Normal'),
    (HIGH, 'High'),
)

Then they are still integers in the DB.

Usage would be thing.priority = Thing.NORMAL

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