我这里有一个大问题,我无法按照我的意愿迁移我的数据库。我测试了很多东西(甚至直接写入数据库......)。它使用 Django 1.7.1 运行,我的数据库使用 Sqlite3 存储。这是我的问题:
我有一个这样的模型:
from django.db import models
import datetime
class UserUsingTime(models.Model):
userid = models.CharField(max_length = 30)
using_time = models.DateTimeField(default = datetime.time())
(我想做的是存储一个计时器。例如,就像比赛中的所有时间一样。)
我在模型末尾添加了这一行:
app_name = models.CharField(max_length = 20, null = True)
然后我运行 python manage makemigrations my_app_name
其结果是:
Migrations for 'my_app_name':
0003_userusingtime_app_name.py:
- Add field app_name to userusingtime
所以现在一切都很好:)但是当我尝试运行python管理迁移
时,我有大量的错误行:
Operations to perform:
Apply all migrations: admin, contenttypes, my_app_name, auth, sessions
Running migrations:
Applying my_app_name.0003_userusingtime_app_name...Traceback (most recent call last):
File "./manage.py", line 8, in
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py", line 160, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py", line 63, in migrate
self.apply_migration(migration, fake=fake)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py", line 97, in apply_migration
migration.apply(project_state, schema_editor)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/migration.py", line 107, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/operations/fields.py", line 37, in database_forwards
field,
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/sqlite3/schema.py", line 167, in add_field
self._remake_table(model, create_fields=[field])
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/sqlite3/schema.py", line 128, in _remake_table
self.create_model(temp_model)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/schema.py", line 209, in create_model
definition, extra_params = self.column_sql(model, field)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/schema.py", line 121, in column_sql
default_value = self.effective_default(field)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/schema.py", line 184, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 627, in get_db_prep_save
prepared=False)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 1286, in get_db_prep_value
value = self.get_prep_value(value)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 1269, in get_prep_value
value = super(DateTimeField, self).get_prep_value(value)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 1171, in get_prep_value
return self.to_python(value)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 1228, in to_python
parsed = parse_datetime(value)
File "/usr/local/lib/python2.7/dist-packages/django/utils/dateparse.py", line 70, in parse_datetime
match = datetime_re.match(value)
TypeError: expected string or buffer
所以我真的不知道下一步该怎么做...另外,似乎有一个 datetime
错误,我无法解释这一点,因为我没有触及任何 datetime
我的模型中的对象...太奇怪了!
请帮我解决这个问题:) 我提前感谢你们(Y)!
最佳答案
您的 using_time
字段定义有错误。 Django 正在提示,因为您尝试在 datetime
容器中存储 time
对象。
DateTimeField
对于您想要表示的内容(时间长度)来说根本就是错误的字段类型。您可以将其切换为 TimeField
,或者仅使用 FloatField
或 IntegerField
来存储秒或毫秒。
(为什么现在只抛出迁移错误?我认为这是因为这个错误没有在 Django 的早期版本中捕获,这是您第一次真正的迁移(即不是最初的假迁移)我在 1.7 中尝试过。)
关于python - Django 1.7 迁移 - 日期时间类型错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26781246/