Django DurationField默认值 [英] Django DurationField default
问题描述
from datetime import timedelta
pause = DurationField(default = timedelta(minutes = 20))
但是在makemigrations它说:
ValueError:无法序列化:datetime.timedelta(0,1200)
有一些值Django无法序列化到迁移文件中。
好的。也许我们应该通过整数?
pause = DurationField(default = int(timedelta(minutes = 20).total_seconds()))
或:
code> pause = DurationField(default = 20 * 60)
makemigrations运行正常,但是对象创建我看到:
for obj in self.query.objs
文件/ home / web / django_env / lib / python3.4 / site-packages / django / db / models / sql / compiler.py,第920行在< listcomp>
对于obj in self.query.objs
文件/home/web/django_env/lib/python3.4/site-packages/django/db/models/sql/compiler.py,第918行,在< listcomp>
)for f in fields
文件/home/web/django_env/lib/python3.4/site-packages/django/db/models/fields/__init__.py,第710行,get_db_prep_save
prepared = False)
文件/home/web/django_env/lib/python3.4/site-packages/django/db/models/fields/__init__.py,第1683行,在get_db_prep_value
return value.total_seconds()* 1000000
AttributeError:'int'对象没有属性'total_seconds'
所以它需要timedelta?
默认值应该是timedelta。这是Django中的一个错误,并且在1.8.1版本中被修改。
请参阅: https://code.djangoproject.com/ticket/24566
所以 pause = DurationField(default = timedelta(minutes = 20))
应该使用1.8。 1版本。
I want to pass default value into DurationField from django 1.8. According to documentation it should be datetime.timedelta
from datetime import timedelta
pause = DurationField(default=timedelta(minutes=20))
But on makemigrations it says:
ValueError: Cannot serialize: datetime.timedelta(0, 1200)
There are some values Django cannot serialize into migration files.
Ok. Maybe we should pass integer?
pause = DurationField(default=int(timedelta(minutes=20).total_seconds()))
or:
pause = DurationField(default=20*60)
makemigrations runs ok, but on object creation I see:
for obj in self.query.objs
File "/home/web/django_env/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 920, in <listcomp>
for obj in self.query.objs
File "/home/web/django_env/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 918, in <listcomp>
) for f in fields
File "/home/web/django_env/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 710, in get_db_prep_save
prepared=False)
File "/home/web/django_env/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 1683, in get_db_prep_value
return value.total_seconds() * 1000000
AttributeError: 'int' object has no attribute 'total_seconds'
So it want timedelta?
The default should be a timedelta. This is a bug in Django and is set to be fixed in the 1.8.1 release. See: https://code.djangoproject.com/ticket/24566
So pause = DurationField(default=timedelta(minutes=20))
Should work with the 1.8.1 release.
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