'NoneType'对象没有属性'encode' [英] 'NoneType' object has no attribute 'encode'

问题描述

我正在GeoDjango中使用GeoAdmin。
我有一个表planet_osm_point，我想在管理界面看到它。
我是django的初学者。

我有这个问题：

 环境：
 
 
请求方法：GET 
请求URL：http://127.0.0.1:8000/admin/api/planetosmpoint/ 
 
 Django版本：1.5.1 
 Python版本：2.7.3 
安装的应用程序：
（'django.contrib.auth'，
'django.contrib。 contenttypes'，
'django.contrib.sessions'，
'django.contrib.sites'，
'django.contrib.messages'，
'django.contrib.staticfiles' ，
'django.contrib.admin'，
'django.contrib.gis'，
'api'，
'portail'）
安装的中间件：
（'django.middleware.common.CommonMiddleware'，
'django.contrib.sessions.middleware.SessionMiddleware'，
'django.middleware.csrf.CsrfViewMiddleware'，
'django。 contrib.auth.middleware.AuthenticationMiddleware'，
'django.contrib.messages.middleware.MessageMiddleware'）
 
 
模板错误：
在模板/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/admin/change_list.html中，第91行的错误
'NoneType'对象没有属性'encode'
 81：{％endif％} 
 
 
 82：{％endblock％} 
 
 
 83：
 
 
 84：< form id =changelist-formaction =method =post{％如果cl.formset.is_multipart％} enctype =multipart / form-data {％endif％}> {％csrf_token％} 
 
 
 85：{％如果cl.formset％} 
 
 
 86： div> {{cl.formset.management_form}}< / div> 
 
 
 87：{％endif％} 
 
 
 88：
 
 
 89：{％block result_list％} 
 
 
 90：{％if action_form and actions_on_top and cl.full_result_count％} {％admin_actions％} {％endif％} 
 
 
 91：{％result_list cl％} 
 
 
 92：{％if action_form and actions_on_bottom and cl.full_result_count％} {％admin_actions％} {％endif％} 
 
 
 93：{％endblock％} 
 
 
 94：{％block pagination％} {％pagination cl％} {％endblock％} 
 
 
 95：< / form> 
 
 
 96：< / div> 
 
 
 97：< / div> 
 
 
 98：{％endblock％} 
 
 
 99：
 
追溯：
文件/ usr / local / lib / python2.7 / dist-packages / django / core / handlers / base.pyin get_response 
 140. response = response.render（）
文件/ usr / local / lib / python2.7 / dist-packages / django / template / response.py在render 
 105. self.content = self.rendered_content 
文件/usr/local/lib/python2.7/ dist_package / django / template / response.py在rendered_content 
 82. content = template.render（context）
文件/usr/local/lib/python2.7/dist-packages/django /template/base.py在render 
 140. return self._render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/base.py in _render 
 134. return self.nodelist.render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/base.py在render 
 830. bit = self.render_node（node，context）
文件/ usr / loca lb / python2.7 / dist-packages / django / template / debug.py在render_node 
中74.返回node.render（上下文）
文件/ usr / local / lib / python2 7 / dist-packages / django / template / loader_tags.pyin render 
 124. return compiled_pa​​rent._render（context）
文件/usr/local/lib/python2.7/dist-packages/ django / template / base.py在_render 
 134. return self.nodelist.render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/ render.py 
 830. base = self.render_node（node，context）
文件/usr/local/lib/python2.7/dist-packages/django/template/debug.py in render_node 
 74. return node.render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py在render 
 124. return compiled_pa​​rent._render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/base.py在_render 
 134. return self。 nodelist.render（续ext）
文件/usr/local/lib/python2.7/dist-packages/django/template/base.py在render 
 830. bit = self.render_node（node，context）
文件/usr/local/lib/python2.7/dist-packages/django/template/debug.py在render_node 
中74.返回node.render（上下文）
文件/在
中的$ usr / local / lib / python2.7 / dist-packages / django / template / loader_tags.py 63. result = block.nodelist.render（context）
文件/ usr / local render 
 830.bat = self.render_node（节点，上下文）
文件/ usr / local / lib /中的/lib/python2.7/dist-packages/django/template/base.py python2.7 / dist-packages / django / template / debug.pyin render_node 
 74. return node.render（context）
文件/usr/local/lib/python2.7/dist- render 
中的包/ django / template / loader_tags.py63. result = block.nodelist.render（context）
文件/usr/local/lib/python2.7/dist-packages/django render 
 830中的/template/base.py。 bit = self.render_node（node，context）
文件/usr/local/lib/python2.7/dist-packages/django/template/debug.py在render_node 
 74.返回节点。 render（context）
文件/usr/local/lib/python2.7/dist-packages/django/template/base.py在render 
 1185. _dict = func（* resolved_args，** resolve_kwargs）
文件/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.pyin result_list 
 286.'results'：list（results （cl））} 
结果中的文件/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py
 264. yield ResultList（None ，items_for_result（cl，res，None））
文件/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py在__init__ 
 256 。super（ResultList，self）.__ init __（* items）
文件/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py在项目中s_for_result 
 184. f，attr，value = lookup_field（field_name，result，cl.model_admin）
文件/usr/local/lib/python2.7/dist-packages/django/contrib/admin/ util_field 
 258. value = attr（）
 __str__中的文件/usr/local/lib/python2.7/dist-packages/django/db/models/base.py 
 433. return force_text（self）.encode（'utf-8'）
 
异常类型：/ admin / api / planetosmpoint / 
处的AttributeError异常值：'NoneType'对象没有属性'encode'
  

我有＃ - - 编码：utf-8 - - 在我的文件的顶部。
你能解释一下如何调试这个吗？

最好的问候
Etienne

解决方案

您有一个模型类，其 __ unicode __ 方法返回无 p>

确保它实际上具有返回Unicode值的返回语句。

I'm trying to use GeoAdmin in GeoDjango. I have a table planet_osm_point and I would like to see it in the admin interface. I'm a beginner in django.

I have this problem :

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/admin/api/planetosmpoint/

Django Version: 1.5.1
Python Version: 2.7.3
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin',
 'django.contrib.gis',
 'api',
 'portail')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Template error:
In template /usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/admin/change_list.html, error at line 91
   'NoneType' object has no attribute 'encode'
   81 :         {% endif %}


   82 :       {% endblock %}


   83 : 


   84 :       <form id="changelist-form" action="" method="post"{% if cl.formset.is_multipart %} enctype="multipart/form-data"{% endif %}>{% csrf_token %}


   85 :       {% if cl.formset %}


   86 :         <div>{{ cl.formset.management_form }}</div>


   87 :       {% endif %}


   88 : 


   89 :       {% block result_list %}


   90 :           {% if action_form and actions_on_top and cl.full_result_count %}{% admin_actions %}{% endif %}


   91 :            {% result_list cl %} 


   92 :           {% if action_form and actions_on_bottom and cl.full_result_count %}{% admin_actions %}{% endif %}


   93 :       {% endblock %}


   94 :       {% block pagination %}{% pagination cl %}{% endblock %}


   95 :       </form>


   96 :     </div>


   97 :   </div>


   98 : {% endblock %}


   99 : 

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  140.                     response = response.render()
File "/usr/local/lib/python2.7/dist-packages/django/template/response.py" in render
  105.             self.content = self.rendered_content
File "/usr/local/lib/python2.7/dist-packages/django/template/response.py" in rendered_content
  82.         content = template.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  830.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  124.         return compiled_parent._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  830.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  124.         return compiled_parent._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  830.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  63.             result = block.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  830.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  63.             result = block.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  830.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  1185.                     _dict = func(*resolved_args, **resolved_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py" in result_list
  286.             'results': list(results(cl))}
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py" in results
  264.             yield ResultList(None, items_for_result(cl, res, None))
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py" in __init__
  256.         super(ResultList, self).__init__(*items)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templatetags/admin_list.py" in items_for_result
  184.             f, attr, value = lookup_field(field_name, result, cl.model_admin)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/util.py" in lookup_field
  258.                 value = attr()
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in __str__
  433.             return force_text(self).encode('utf-8')

Exception Type: AttributeError at /admin/api/planetosmpoint/
Exception Value: 'NoneType' object has no attribute 'encode'

I have # -- coding: utf-8 -- at the top of my files. Can you explain me how to debug this ?

Best regards Etienne

解决方案

You have a model class whose __unicode__ method is returning None.

Make sure it actually has a return statement that returns a Unicode value instead.

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