如何以编程方式获取Django模型字段的max_length? [英] How can I programmatically obtain the max_length of a Django model field?
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问题描述
class Person(models.Model):
name = models.CharField(max_length = 50)
#...
如何编程获取名称
字段的 max_length
值
解决方案
Person._meta.get_field('name')。max_length
将给你这个值。
b
编辑:正如卡尔指出的那样,这个命名是误导的,使用它似乎是可以接受的: http://www.b-list.org/weblog/2007/nov/04/working-models/
Say I have a Django class something like this:
class Person(models.Model):
name = models.CharField(max_length=50)
# ...
How can I programatically obtain the max_length
value for the name
field?
解决方案
Person._meta.get_field('name').max_length
will give you this value. But having to use _meta
suggests this is something you shouldn't do in normal usage.
Edit: as Carl pointed out, this naming is misleading and it does seem quite acceptable to use it: http://www.b-list.org/weblog/2007/nov/04/working-models/
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