我的models.py文件如下
Class Project(models.Model):
ABI_choices = (
('android-tv/x86','android-tv/x86'),
('abi_2', 'google_apis/x86'),
('abi_3','google_apis/x86_64'), )
Screen_size = (
(1,"Landscape"),
(2,"Prtarit")
)
API_level = (
('android-22','Lolipop'),
('android-23','kitkat'),
('android-25','marshmellow'),
)
CPU_delay = (
(1,0),
(2,100),
(3,200),
(4,300),
(5,400),
(6,500),
)
Network_delay = (
(1,20),
(2,30),
(3,40),
(4,50),
(5,60),
)
abi = models.CharField(choices = ABI_choices,max_length=100,default=None)
screen = models.CharField(choices = Screen_size,max_length=100,default=None)
version = models.CharField(choices = API_level,max_length=100,default=None)
GSM = models.CharField(choices = CPU_delay,max_length=100,default=None)
network_delay = models.CharField(choices = Network_delay,max_length=100,default=None)
但是当我尝试运行迁移时,它会向我显示以下错误
django.db.utils.IntegrityError:NOT NULL约束失败: app_test_project__new.Network_delay
答案 0 :(得分:3)
而不是:
models.CharField(choices = ABI_choices,max_length=100,default=None)
使用:
models.CharField(choices = ABI_choices,max_length=100,null=True, blank=True)
对于非必填字段的任何字段或您计划允许null
或empty
值的字段。