我在Django 1.4上有一个错误消息:
dictionary update sequence element #0 has length 1; 2 is required
它发生在我尝试使用模板标签，如:{% v在值%}:
dictionary update sequence element #0 has length 1; 2 is required
Request Method: GET
Request URL: ...
Django Version: 1.4.5
Exception Type: ValueError
Exception Value:
dictionary update sequence element #0 has length 1; 2 is required
Exception Location: /usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __init__, line 21
Python Executable: /usr/bin/uwsgi-core
Python Version: 2.7.3
Python Path:
['/var/www/',
'.',
'',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2',
'/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/PIL',
'/usr/lib/pymodules/python2.7']
Server time: sam, 13 Jul 2013 16:15:45 +0200
Error during template rendering
In template /var/www/templates/app/index.html, error at line 172
dictionary update sequence element #0 has length 1; 2 is required
172 {% for product in products %}
Traceback Switch to copy-and-paste view
/usr/lib/python2.7/dist-packages/django/core/handlers/base.py in get_response
response = callback(request, *callback_args, **callback_kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py in _wrapped_view
return view_func(request, *args, **kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/views/decorators/http.py in inner
return func(request, *args, **kwargs)
...
▶ Local vars
./app/views.py in index
context_instance=RequestContext(request))
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/shortcuts/__init__.py in render_to_response
return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader.py in render_to_string
return t.render(context_instance)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
return self._render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in _render
return self.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader_tags.py in render
return compiled_parent._render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in _render
return self.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader_tags.py in render
result = block.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/defaulttags.py in render
len_values = len(values)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/core/paginator.py in __len__
return len(self.object_list)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/query.py in __len__
self._result_cache = list(self.iterator())
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/query.py in iterator
obj = model(*row[index_start:aggregate_start])
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/base.py in __init__
setattr(self, field.attname, val)
...
▶ Local vars
/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __set__
value = self.field._attribute_class(value, self.field, obj)
...
▶ Local vars
/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __init__
super(HStoreDictionary, self).__init__(value, **params)
...
▶ Local vars
当我尝试访问hstore queryset时，也会发生这种情况:
Traceback (most recent call last):
File "manage.py", line 14, in <module>
execute_manager(settings)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 459, in execute_manager
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 382, 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 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
output = self.handle(*args, **options)
File "/home/name/workspace/project/app/data/commands/my_command.py", line 60, in handle
item_id = tmp[0].id,
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 207, in __getitem__
return list(qs)[0]
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 87, in __len__
self._result_cache.extend(self._iter)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 301, in iterator
obj = model(*row[index_start:aggregate_start])
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 300, in __init__
setattr(self, field.attname, val)
File "/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py", line 38, in __set__
value = self.field._attribute_class(value, self.field, obj)
File "/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py", line 21, in __init__
super(HStoreDictionary, self).__init__(value, **params)
ValueError: dictionary update sequence element #0 has length 1; 2 is required
代码是:
tmp = Item.objects.where(HE("kv").contains({'key':value}))
if tmp.count() > 0:
item_id = tmp[0].id,
我只是想求值。我不明白“更新序列”消息。当我使用游标而不是hstore queryset时，该函数工作。错误也出现在模板渲染上。我刚刚重新启动了uwsgi，一切正常，但错误稍后又回来了。
