尝试将此功能用作信号处理程序：
def location_title(sender, instance, created, **kwargs):
# Don't fire up on updates.
if not created:
return
# Only handle new superusers.
if not instance.is_superuser or not instance.is_active:
return
# Create a `Location` entry for new superuser.
l = Location(user_id=instance.pk)
l.save()
post_save.connect(location_title, sender=User)
向模型字段添加选择：
Django CharField有一个命名参数choices，可让您为最终用户提供可能值的列表，并以表格形式对其进行正确验证。可迭代的格式如下<internal_value>, <display_value>。将字段传递给choices参数后，您可以使用方法访问与其内部值相关的显示值instance.get_<field_name>_display()。
可迭代的选择可能如下所示：
class Location(models.Model):
class Title:
CLASSROOM = 'classroom'
PLAYGROUND = 'playground'
STAFF_ROOM = 'staff_room'
TITLE_CHOICES = (
(Title.CLASSROOM, 'Classroom'),
(Title.PLAYGROUND, 'Playground'),
(Title.STAFF_ROOM, 'Staff Room'),
)
user = models.ForeignKey(User,null=True)
title = models.CharField('Incident Type', max_length=200,choices=TITLE_CHOICES,default=Title.CLASSROOM)
parent_location_id = models.CharField('Parent Location', max_length=100, null=True, blank=True)
is_active = models.BooleanField('Is Active', default=True)
最终的解决方案如下：
class Location(models.Model):
class Title:
CLASSROOM = 'classroom'
PLAYGROUND = 'playground'
STAFF_ROOM = 'staff_room'
BASE_LOCATION = Title.CLASSROOM
TITLE_CHOICES = (
(Title.CLASSROOM, 'Classroom'),
(Title.PLAYGROUND, 'Playground'),
(Title.STAFF_ROOM, 'Staff Room'),
)
user = models.ForeignKey(User,null=True)
title = models.CharField('Incident Type', max_length=200,choices=TITLE_CHOICES,default=Title.CLASSROOM)
parent_location_id = models.CharField('Parent Location', max_length=100, null=True, blank=True)
is_active = models.BooleanField('Is Active', default=True)
def location_title(sender, instance, created, **kwargs):
# Don't fire up on updates.
if not created:
return
# Only handle new superusers.
if not instance.is_superuser or not instance.is_active:
return
# Create a `Location` entry for new superuser.
base = Location(user_id=instance.pk, title=Location.BASE_LOCATION)
base.save()
for value, _ in Location.TITLE_CHOICES:
if value == Location.BASE_LOCATION:
continue
l = Location(user_id=instance.pk, title=value, parent_location_id=base.pk)
l.save()
post_save.connect(location_title, sender=User)
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