【发布时间】：2016-05-30 10:08:27
【问题描述】：
我最近切换到 postgresql，我认为一切正常，直到我意识到当我发布帖子时，对于类型字符变化（100），我得到的值太长了。现在我用谷歌搜索，看到了一些类似的问题，但是当我尝试一些解决方案时，它们都没有奏效。我将解释为什么我的问题在我看来是不同的。我在models.py中有这段代码
class Post(models.Model):
url = models.URLField(max_length=250, blank=True, null=True)
slug = models.CharField(max_length=255, unique=True)
objects = models.Manager()
@property
def save(self, *args, **kwargs):
self.slug = uuslug(self.title, instance=self, max_length=255)
super(Post, self).save(*args, **kwargs)
当我看到一些推荐的解决方案时，我确实尝试将我的 max_length 更改为 100。我不知道为什么会发生这种情况，我在 db 中没有任何内容。我最近切换到 postgresql。你能帮助我为什么会发生这个错误以及我该如何解决它？我应该离开 uuslug 吗？
完整模型
.
class Category(models.Model):
name = models.CharField(max_length=128, unique=True)
description = models.TextField(verbose_name=('describe'))
author = models.ForeignKey(settings.AUTH_USER_MODEL)
def __unicode__(self):
return self.name
def get_absolute_url(self):
return "/category/%s/" %self.name
def my_handler(sender, instance, created, **kwargs):
action.send(instance.author, verb='following', target=Category)
post_save.connect(my_handler, sender=Category)
class Post(models.Model):
category = models.ForeignKey(Category, verbose_name=('community'))
pub_date = models.DateTimeField(auto_now_add = True)
url = models.URLField(max_length=250, blank=True, null=True)
video = EmbedVideoField(verbose_name='link',help_text="Youtube", blank=True, null=True)
title = models.CharField(max_length = 50)
moderator = models.ForeignKey(User)
views = models.IntegerField(default=0)
slug = models.CharField(max_length=255, unique=True)
objects = models.Manager() # default manager
content = RichTextUploadingField(config_name='default')
rank_score = models.FloatField(default= 1)
image = models.ImageField(upload_to='images',blank=True, null=True)
thumbnail = models.ImageField(upload_to='images', blank=True, null=True)
@property
def domain(self):
long_url = urlparse(self.url).netloc if self.url else "be kind to one another"
return long_url.split('.', 1)[1] if long_url.split('.', 1)[0] == 'www' else long_url
def save(self, *args, **kwargs):
self.slug = uuslug(self.title, instance=self, max_length=255)
super(Post, self).save(*args, **kwargs)
def __unicode__(self):
return self.title
这是完整的追溯
T
raceback:
File "env/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "env/local/lib/python2.7/site-packages/django/views/generic/base.py" in view
71. return self.dispatch(request, *args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
34. return bound_func(*args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
30. return func.__get__(self, type(self))(*args2, **kwargs2)
File "ebagu/main/views.py" in dispatch
191. return super(PostCreateView, self).dispatch(request, *args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
89. return handler(request, *args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/views/generic/edit.py" in post
249. return super(BaseCreateView, self).post(request, *args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/views/generic/edit.py" in post
215. return self.form_valid(form)
File "ebagu/main/views.py" in form_valid
186. self.object.save()
File "ebagu/main/models.py" in save
66. super(Post, self).save(*args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/db/models/base.py" in save
734. force_update=force_update, update_fields=update_fields)
File "env/local/lib/python2.7/site-packages/django/db/models/base.py" in save_base
762. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "env/local/lib/python2.7/site-packages/django/db/models/base.py" in _save_table
846. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "env/local/lib/python2.7/site-packages/django/db/models/base.py" in _do_insert
885. using=using, raw=raw)
File "env/local/lib/python2.7/site-packages/django/db/models/manager.py" in manager_method
127. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "env/local/lib/python2.7/site-packages/django/db/models/query.py" in _insert
920. return query.get_compiler(using=using).execute_sql(return_id)
File "env/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
974. cursor.execute(sql, params)
File "env/local/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
79. return super(CursorDebugWrapper, self).execute(sql, params)
File "env/local/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
64. return self.cursor.execute(sql, params)
File "env/local/lib/python2.7/site-packages/django/db/utils.py" in __exit__
97. six.reraise(dj_exc_type, dj_exc_value, traceback)
File "env/local/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
64. return self.cursor.execute(sql, params)
Exception Type: DataError at /add_post/
Exception Value: value too long for type character varying(100)
【问题讨论】：
-
你有一个没有预定义长度的 SlugField？将其设置为 255 并迁移
-
我在您的代码中没有看到任何带有
max_length=100的字段，所以我怀疑您没有显示所有/相关代码。无论如何，问题如下（您可能通过谷歌搜索发现） - 当您在 MySQL 中保存太长的值时，它只会在不告诉您的情况下修剪该值，因此您可以获得残缺的数据。相反，PgSQL 会大声死去。因此，您必须找到哪个字段的限制为 100 个字符，并相应地修剪数据，或者按照上面评论中的@MushahidKhan 建议增加限制 -
@yedpodtrzitko 我没有任何限制为 100 个字符的字段。我会发布我的完整模型
-
请显示错误回溯
-
@chem1st 我已经添加了回溯......真的希望这个问题得到解决
标签： django postgresql