Django AttributeError“datetime.date”对象没有属性“utcoffset”

问题描述 投票：0回答：3

我是 Django 的新手，如果问题的解释看起来很奇怪，很抱歉。

我在 Django 项目中创建了一个博客应用程序。

models.py：

from django.db import models

class Blog(models.Model):
    title = models.CharField(max_length=255)
    pub_date = models.DateTimeField() # issue appears because of this statement
    body = models.TextField()
    image = models.ImageField(upload_to='images/')

当我在网站的管理页面中创建一个新的博客对象时，一切都很好，并且对象被创建并存储到数据库中。但是当我想编辑这个博客对象（在博客列表中单击它）时，我收到此错误：

AttributeError at /admin/blog/blog/2/change/
'datetime.date' object has no attribute 'utcoffset'

完整追溯：

Environment:


Request Method: GET
Request URL: http://localhost:8000/admin/blog/blog/2/change/

Django Version: 2.0.2
Python Version: 3.6.4
Installed Applications:
['jobs.apps.JobsConfig',
 'blog.apps.BlogConfig',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']


Template error:
In template C:\Users\LENOVO\Anaconda3\lib\site-packages\django\contrib\admin\templates\admin\includes\fieldset.html, error at line 19
   'datetime.date' object has no attribute 'utcoffset'
   9 :             {% for field in line %}
   10 :                 <div{% if not line.fields|length_is:'1' %} class="field-box{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% if not field.is_readonly and field.errors %} errors{% endif %}{% if field.field.is_hidden %} hidden{% endif %}"{% elif field.is_checkbox %} class="checkbox-row"{% endif %}>
   11 :                     {% if not line.fields|length_is:'1' and not field.is_readonly %}{{ field.errors }}{% endif %}
   12 :                     {% if field.is_checkbox %}
   13 :                         {{ field.field }}{{ field.label_tag }}
   14 :                     {% else %}
   15 :                         {{ field.label_tag }}
   16 :                         {% if field.is_readonly %}
   17 :                             <div class="readonly">{{ field.contents }}</div>
   18 :                         {% else %}
   19 :                              {{ field.field }} 
   20 :                         {% endif %}
   21 :                     {% endif %}
   22 :                     {% if field.field.help_text %}
   23 :                         <div class="help">{{ field.field.help_text|safe }}</div>
   24 :                     {% endif %}
   25 :                 </div>
   26 :             {% endfor %}
   27 :         </div>
   28 :     {% endfor %}
   29 : </fieldset>


Traceback:

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\core\handlers\exception.py" in inner
  35.             response = get_response(request)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\core\handlers\base.py" in _get_response
  158.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\core\handlers\base.py" in _get_response
  156.                 response = response.render()

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\response.py" in render
  106.             self.content = self.rendered_content

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\response.py" in rendered_content
  83.         content = template.render(context, self._request)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\backends\django.py" in render
  61.             return self.template.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  175.                     return self._render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\loader_tags.py" in render
  155.             return compiled_parent._render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\loader_tags.py" in render
  155.             return compiled_parent._render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\loader_tags.py" in render
  67.                 result = block.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\loader_tags.py" in render
  67.                 result = block.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\defaulttags.py" in render
  211.                     nodelist.append(node.render_annotated(context))

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\loader_tags.py" in render
  194.                 return template.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  177.                 return self._render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\defaulttags.py" in render
  211.                     nodelist.append(node.render_annotated(context))

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\defaulttags.py" in render
  211.                     nodelist.append(node.render_annotated(context))

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\defaulttags.py" in render
  314.                 return nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\defaulttags.py" in render
  314.                 return nodelist.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render
  999.         return render_value_in_context(output, context)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\template\base.py" in render_value_in_context
  978.             value = str(value)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\utils\html.py" in <lambda>
  371.     klass.__str__ = lambda self: mark_safe(klass_str(self))

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\boundfield.py" in __str__
  36.         return self.as_widget()

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\boundfield.py" in as_widget
  118.             **kwargs

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\widgets.py" in render
  234.         context = self.get_context(name, value, attrs)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\contrib\admin\widgets.py" in get_context
  104.         context = super().get_context(name, value, attrs)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\widgets.py" in get_context
  806.             value = self.decompress(value)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\widgets.py" in decompress
  894.             value = to_current_timezone(value)

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\forms\utils.py" in to_current_timezone
  176.     if settings.USE_TZ and value is not None and timezone.is_aware(value):

File "C:\Users\LENOVO\Anaconda3\lib\site-packages\django\utils\timezone.py" in is_aware
  247.     return value.utcoffset() is not None

Exception Type: AttributeError at /admin/blog/blog/2/change/
Exception Value: 'datetime.date' object has no attribute 'utcoffset'

如果我将 

models.DateTimeField()
更改为 
models.DateField()
或将 
auto_now_add=True
添加到 
DateTimeField
（以便使该字段不可编辑），一切都会变得正常，并且博客对象变得可编辑，不会出现错误。

所以问题显然是导致此错误的原因以及如何修复它？

Django 版本 2.0.2（也在 2.0.5 上尝试过）

Python版本3.6.4

python django django-models
3个回答
24
投票

似乎模型实例返回了日期数据。查看数据库列，看看其类型是否不是日期。可能之前在数据库创建过程中，您的模型将 

pub_date
作为 DateField。如果是这样，请运行 
makemigrations
和 
migrate
根据您当前的模型调整数据库类型。

1
投票

这可能是因为您更改或更改了某些模型字段，并且没有迁移项目来更新数据库。您需要做的就是运行 migrate 命令，然后就可以开始了。

0
投票

当我使用 django drf serializers.DateTimeField 作为定义为 models.DateField 的模型字段时，我遇到了同样的错误

class Invoice(models.Model):
    # ... other fields
    due_date = models.DateField()

from rest_framework import serializers


class InvoiceSerializer(serializers.ModelSerializer)
    due_date = serializers.DateTimeField()

    class Meta:
        model = Invoice

将其更改为 

due_date = serializers.DateField()
解决了问题。

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