django选择字段的默认值 [英] default value for django choice field
本文介绍了django选择字段的默认值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
假设类照片是持有包含选择字段和其他属性的照片:
类照片(model.Model):
/ pre>
ONLYME ='O'
FRIENDS ='F'
PUBLIC ='P'
选择=(
(ONLYME,我 ),
(FRIENDS,朋友),
(PUBLIC,Public),
)
display = models.CharField(max_length = 1,选择= CHOICES,blank = True,null = True)
user = models.ForeignKey(User)
description = models.TextField()
pub_date = models.DateTimeField(auto_now = True,auto_now_add =
update = models.DateTimeField(auto_now = False,auto_now_add = True)
image = models.ImageField(upload_to = get_upload_file_name,blank = True)
现在,如何将照片的默认值或初始值设置为
显示中的好友
属性?解决方案使用
default
属性:display = models.CharField(...,default = FRIENDS)
或
display = models.CharField(...,default = CHOICES [1] [1])
Suppose class Photo is to hold photos having choice fields and other attributes:
class Photo(models.Model): ONLYME = 'O' FRIENDS = 'F' PUBLIC = 'P' CHOICES = ( (ONLYME, "Me"), (FRIENDS, "Friends"), (PUBLIC, "Public"), ) display = models.CharField(max_length=1, choices=CHOICES, blank=True, null=True) user = models.ForeignKey(User) description = models.TextField() pub_date = models.DateTimeField(auto_now=True, auto_now_add=False) update = models.DateTimeField(auto_now=False, auto_now_add=True) image = models.ImageField(upload_to=get_upload_file_name, blank=True)
Now, how do I set the default or initial value of a photo to 'Friends' in the
display
attribute?解决方案Use the
default
attribute:display = models.CharField(..., default=FRIENDS)
or
display = models.CharField(..., default=CHOICES[1][1])
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