Django datetime迁移错误 [英] Django datetime migration error
本文介绍了Django datetime迁移错误的处理方法，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
有我的模型：
class UserProfile（models.Model）：
＃此行是必需的。将UserProfile链接到用户模型实例。
user = models.OneToOneField（User）
＃我们希望包含的其他属性。
website = models.URLField（blank = True）
picture = models.ImageField（upload_to ='profile_images'，blank = True）
＃覆盖__unicode__ （）方法返回有意义的东西！
def __unicode __（self）：
return self.user.username
＃可以创建更多的帖子类或引入外键。不确定现在。
class Post（models.Model）：
title = models.CharField（max_length = 140）
body = models.TextField（）
date = models.DateTimeField（blank = True ）
INTRODUCTION ='I'
STORIES ='S'
CATEGORY_CHOICES =（
（STORIES，'Stories'），＃变量名称和显示值
（简介，介绍自己），
）
category = models.CharField（max_length = 1，
choices = CATEGORY_CHOICES，
default =简介）
def __unicode __（self）：
return self.title
class照片（models.Model）：
title = models.CharField（max_length = 140）
photo = models.ImageField（upload_to ='user_images'，blank = True，null = True）
date = models.DateTimeField（blank = True）
description = models.TextField（）
def __unicode __（self）：
return self.t itle
运行manage.py migrate时，我遇到以下错误。检查了其他答案后，似乎这与datetime使用不正确有关，但即使我删除日期和DateTime字段，错误仍然存在。有人有任何想法吗？
非常感谢您的帮助。
要执行的操作：
应用所有迁移：contenttypes，admin，sessions，auth，blog
运行迁移：
应用blog.0007_auto_20141201_0034 ...追溯（最近呼叫最后）：
文件manage.py，第10行，在< module>
execute_from_command_line（sys.argv）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__.py，行385，在execute_from_command_line
utility.execute（）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__ .py，第377行，执行
self.fetch_command（子命令）.run_from_argv（self.argv）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4 /site-packages/django/core/management/base.py，第288行，在run_from_argv
self.execute（* args，** options .__ dict__）
文件/ Library / Frameworks / Python .bramework / Versions / 3.4 / lib / python3.4 / site-packages / django / core / management / base.py，第338行，执行
output = self.handle（* args，** options）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/commands/migrate.py，第160行，手头e
executor.migrate（targets，plan，fake = options.get（fake，False））
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4 /site-packages/django/db/migrations/executor.py，第63行，迁移
self.apply_migration（migration，fake = fake）
文件/Library/Frameworks/Python.framework/版本/ 3.4 / lib / python3.4 / site-packages / django / db / migrations / executor.py，第97行，apply_migration
migration.apply（project_state，schema_editor）
文件/ Library /Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/migration.py，第107行，应用
operation.database_forwards（self.app_label，schema_editor ，project_state，new_state）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/operations/fields.py，第37行，在database_forwards
字段，
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/djang o / db / backends / sqlite3 / schema.py，第160行，add_field
self._remake_table（model，create_fields = [field]）
文件/Library/Frameworks/Python.framework/Versions /3.4/lib/python3.4/site-packages/django/db/backends/sqlite3/schema.py，第74行，_remake_table
self.effective_default（field）
文件/ Library /框架/ Python.framework /版本/ 3.4 / lib / python3.4 / site-packages / django / db / backends / schema.py，第183行在effective_default
default = field.get_db_prep_save（default，self。连接）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py，第627行，在get_db_prep_save
prepared = False）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py，行1286，在get_db_prep_value
value = self.get_prep_value（value）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/sit e-packages / django / db / models / fields / __ init__.py，第1269行，get_prep_value
value = super（DateTimeField，self）.get_prep_value（value）
文件/ Library / Frameworks / Python.framework / Versions / 3.4 / lib / python3.4 / site-packages / django / db / models / fields / __ init__.py，第1171行，get_prep_value
return self.to_python（value）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py，第1228行，to_python
parsed = parse_datetime（value）
文件/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/utils/dateparse.py，第70行，在parse_datetime
match = datetime_rematch（value）
TypeError：预期的字符串或缓冲区
'blog.0007 ...'迁移似乎是失败的。为了澄清发生了什么，我试图添加一些属性，以便告诉谁发布，什么时候等等。根据计划，显然有些事情不行。
＃ - * - 编码：utf-8 - * -
从__future__导入unicode_literals
从django.db导入模型，迁移
从django.conf导入设置
类迁移（migrations.Migration）：
依赖关系= [
migrations.swappable_dependency（settings.AUTH_USER_MODEL） ，
（'blog'，'0006_auto_20141201_0027'），
]
operations = [
migrations.AddField（
model_name ='post'，
name ='created_by'，
field = models.ForeignKey（default = 0，related_name ='created_by'，to = settings.AUTH_USER_MODEL），
preserve_default = False，
）
migrations.AddField（
model_name ='post'，
name ='c reated_on'，
field = models.DateTimeField（default = 0，auto_now_add = True），
preserve_default = False，
），
migrations.AddField（
model_name = 'post'，
name ='edited_by'，
field = models.ForeignKey（default = 0，related_name ='edited_by'，to = settings.AUTH_USER_MODEL），
preserve_default = False，
），
migrations.AddField（
model_name ='post'，
name ='edited_on'，
field = models.DateTimeField（default = 0，auto_now = True ）
preserve_default = False，
），
migrations.AddField（
model_name ='post'，
name ='published'，
field = models.BooleanField（default = None），
preserve_default = True，
），
]
解决方案
我认为问题是他re：
DateTimeField（default = 0 ...）
使用无或 datetime 对象
I don't think anything in my model has changed. I have reverted it back to times when it was all fully functional and I still get the following errors.
There are my models:
class UserProfile(models.Model):
# This line is required. Links UserProfile to a User model instance.
user = models.OneToOneField(User)
# The additional attributes we wish to include.
website = models.URLField(blank=True)
picture = models.ImageField(upload_to='profile_images', blank=True)
# Override the __unicode__() method to return out something meaningful!
def __unicode__(self):
return self.user.username
# Could create more post classes, or introduce foreign keys. Unsure as of now.
class Post(models.Model):
title = models.CharField(max_length = 140)
body = models.TextField()
date = models.DateTimeField(blank=True)
INTRODUCTION = 'I'
STORIES = 'S'
CATEGORY_CHOICES = (
(STORIES, 'Stories'), # Variable name and display value
(INTRODUCTION, 'Introduce Yourself'),
)
category = models.CharField(max_length=1,
choices=CATEGORY_CHOICES,
default=INTRODUCTION)
def __unicode__(self):
return self.title
class Photo(models.Model):
title = models.CharField(max_length = 140)
photo = models.ImageField(upload_to='user_images', blank=True, null=True)
date = models.DateTimeField(blank=True)
description = models.TextField()
def __unicode__(self):
return self.title
Upon running manage.py migrate I am confronted with the following error. Having checked the other answers, it seems it was something to do with datetime being used incorrectly but even if I remove date and the DateTime field altogether the error still persists. Does anyone have any ideas?
Thank very much for your help.
Operations to perform:
Apply all migrations: contenttypes, admin, sessions, auth, blog
Running migrations:
Applying blog.0007_auto_20141201_0034...Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 160, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/executor.py", line 63, in migrate
self.apply_migration(migration, fake=fake)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/executor.py", line 97, in apply_migration
migration.apply(project_state, schema_editor)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/migration.py", line 107, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/operations/fields.py", line 37, in database_forwards
field,
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/sqlite3/schema.py", line 160, in add_field
self._remake_table(model, create_fields=[field])
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/sqlite3/schema.py", line 74, in _remake_table
self.effective_default(field)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/backends/schema.py", line 183, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 627, in get_db_prep_save
prepared=False)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 1286, in get_db_prep_value
value = self.get_prep_value(value)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 1269, in get_prep_value
value = super(DateTimeField, self).get_prep_value(value)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 1171, in get_prep_value
return self.to_python(value)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 1228, in to_python
parsed = parse_datetime(value)
File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/utils/dateparse.py", line 70, in parse_datetime
match = datetime_re.match(value)
TypeError: expected string or buffer
Here is 'blog.0007...' migration that seems to be failing. To clarify what is going on I was attempting to add a few attributes in order to tell who posted, and at what time etc. Clearly something is not going according to plan..
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
from django.conf import settings
class Migration(migrations.Migration):
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
('blog', '0006_auto_20141201_0027'),
]
operations = [
migrations.AddField(
model_name='post',
name='created_by',
field=models.ForeignKey(default=0, related_name='created_by', to=settings.AUTH_USER_MODEL),
preserve_default=False,
),
migrations.AddField(
model_name='post',
name='created_on',
field=models.DateTimeField(default=0, auto_now_add=True),
preserve_default=False,
),
migrations.AddField(
model_name='post',
name='edited_by',
field=models.ForeignKey(default=0, related_name='edited_by', to=settings.AUTH_USER_MODEL),
preserve_default=False,
),
migrations.AddField(
model_name='post',
name='edited_on',
field=models.DateTimeField(default=0, auto_now=True),
preserve_default=False,
),
migrations.AddField(
model_name='post',
name='published',
field=models.BooleanField(default=None),
preserve_default=True,
),
]
解决方案
I think the problem is here:
DateTimeField(default=0...)
Either use None or a datetime object
这篇关于Django datetime迁移错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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