我正在尝试为我的自定义用户模型的选定用户创建版本表单，但不幸的是，这是我在获取表单时得到的结果:
ValueError at /changeCustomUser/ too many values to unpack
它跟踪我到模板和 View 文件 - 我将在代码错误位置进行标记。
模型.py
class CustomUserManager(UserManager):
def create_user(self, username, email=None, password=None, **extra_fields):
return UserManager.create_user(self, username, email=email, password=password, **extra_fields)
def create_superuser(self, username, email, password, **extra_fields):
return UserManager.create_superuser(self, username, email, password, **extra_fields)
class CustomUser(AbstractUser):
role = models.CharField(max_length = 1, default = 'C')
objects = CustomUserManager()
class Meta(AbstractUser.Meta):
swappable = 'My_app.CustomUser'
表单.py
class CustomUserChangeForm(UserChangeForm):
def __init__(self, choices_list, *args, **kwargs):
super(CustomUserChangeForm, self).__init__(*args, **kwargs)
if choices_list:
self.fields['role']=forms.ChoiceField(label='Function', choices=choices_list, widget=forms.Select, required = True)
del self.fields['password']
del self.fields['username']
class Meta(UserChangeForm.Meta):
model = CustomUser
fields = ('first_name', 'role')
View .py
def changeCustomUser(request):
if request.method == 'POST':
customUserChangeForm = CustomUserChangeForm(request.POST, instance=request.user)
if customUserChangeForm.is_valid():
customUserChangeForm.save()
return HttpResponseRedirect('/changeCustomUser/?customUser=saved')
else:
e1 = str(request.user)
if e1 == 'AnonymousUser':
context1={'welcome_id': 'Welcome Guest :)', 'form': 'Log in to change user details', 'error': ''}
else:
"""ERROR TRACE"""
context1={'welcome_id': 'Welcome '+request.user.first_name + ' :)', 'form': customUserChangeForm,'error': 'Make data valid'}
return render_to_response('changeCustomUser.html', context1 ,context_instance=RequestContext(request))
else:
e1 = str(request.user)
if e1 == 'AnonymousUser':
context1={'welcome_id': 'Welcome Guest', 'error': ''}
else:
if request.user.role == 'A':
customUserChangeForm = CustomUserChangeForm(initial = {'first_name': request.user.first_name, 'role': request.user.role},
choices_list=[('A', 'B', 'C')]
)
elif request.user.role == 'B':
customUserChangeForm = CustomUserChangeForm(initial = {'first_name': request.user.first_name, 'role': request.user.role},
choices_list=[('B', 'C')]
)
if request.GET.get('customUser', '') == 'saved':
context1={'welcome_id': 'Welcome '+request.user.first_name + ' :)', 'form': customUserChangeForm,'error': 'Details changed succesfully.'}
else:
context1={'welcome_id': 'Welcome '+request.user.first_name + ' :)', 'form': customUserChangeForm,'error': ''} # SECOND ERROR TRACE
return render_to_response('changeCustomUser.html', context1 ,context_instance=RequestContext(request))
更改自定义用户.html
{# Other fields declared as follows, but without role conditions: #}
{% if user.role == "A" or user.role == "B" %}
<tr>
<td>{{ form.role.label_tag }}</td>
"""ERROR TRACE"""
<td>{{ form.role }}</td>
</tr>
{% endif %}
如您所见，我在“角色”字段中设置自己的权限，不同的角色可以执行不同的更改。回到问题: 我尝试通过传递先前 View 中的变量来切换 request.user 一段时间:
if request.GET.get('username_get', '') != '':
sub_user = Reader.objects.get(username=str(request.GET.get('username_get', '')))
else:
sub_user = request.user
这至少帮助我显示了我选择更改的用户的正确数据。遗憾的是 - 该用户切换仅持续到我点击 POST 为止，因为传递的参数丢失，并且错误结果与上面所示相同(需要解压的值太多)。我所能得到的只是编辑登录的用户而不是我选择编辑的用户。 我当然尝试找出为什么这些值是错误的，但网络搜索仅确认它们需要保持元组格式，以便选择小部件可以处理它们。 有什么想法如何对具有“A”/“B”角色的选定用户进行操作吗？
编辑:我的错。抱歉，因为不小心。我上面谈到了元组，但没有提供元组。我已经得到了它们，就像你说的:
choices_list=[('A','A'), ('B','B'), ('C', 'C')]
单一选择列表也不起作用。感谢非常有用的提示。我会立即改进我的代码。由于 Choices_list 的特定部分没有问题 - 下面是完整的回溯:
Environment:
Request Method: POST
Request URL: http://localhost:8000/changeCustomUser/
Django Version: 1.7.1
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'My_app')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware')
Template error:
In template /var/www/html/DjangoApps/My_app/templates/changeCustomUser.html, error at line 22
too many values to unpack
16 : <td>{{ form.email.label_tag }}</td>
17 : <td>{{ form.email }}</td>
18 : </tr>
19 : {% if user.role == "A" or user.role == "B" %}
20 : <tr>
21 : <td>{{ form.role.label_tag }}</td>
22 : <td> {{ form.role }} </td>
23 : </tr>
24 : {% endif %}
25 : <tr>
26 : <td>{{ form.user_address.label_tag }}</td>
27 : <td>{{ form.user_address }}</td>
28 : </tr>
29 : </table>
Traceback:
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/core/handlers/base.py" in get_response
111. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/var/www/html/DjangoApps/My_app/views.py" in changeCustomUser
88. return render_to_response('changeCustomUser.html', context1 ,context_instance=RequestContext(request))
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/shortcuts.py" in render_to_response
23. return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/loader.py" in render_to_string
178. return t.render(context_instance)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in render
148. return self._render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in _render
142. return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in render
844. bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/debug.py" in render_node
80. return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/loader_tags.py" in render
126. return compiled_parent._render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in _render
142. return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in render
844. bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/debug.py" in render_node
80. return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/loader_tags.py" in render
65. result = block.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in render
844. bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/debug.py" in render_node
80. return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/defaulttags.py" in render
312. return nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/base.py" in render
844. bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/debug.py" in render_node
80. return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/template/debug.py" in render
93. output = force_text(output)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/utils/encoding.py" in force_text
85. s = six.text_type(s)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/forms/forms.py" in __str__
508. return self.as_widget()
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/forms/forms.py" in as_widget
560. return force_text(widget.render(name, self.value(), attrs=attrs))
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/forms/widgets.py" in render
504. options = self.render_options(choices, [value])
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.1-py2.7.egg/django/forms/widgets.py" in render_options
530. for option_value, option_label in chain(self.choices, choices):
Exception Type: ValueError at /changeCustomUser/
Exception Value: too many values to unpack
PS 发现三个错别字。抱歉，但是经过一整夜的尝试使其发挥作用后，我可能没有像我应该的那样专注。
最佳答案
请发布完整回溯 - 但我怀疑您的问题出在这一行:
choices_list=[('A', 'B', 'C')]
选择列表应该是(值，标签)对的序列(列表或其他)。将上面的内容替换为:
choices_list=[('A','A'), ('B','B'), ('C', 'C')]
以及这个(被解释为具有值“B”和标签“C”的单选列表):
choices_list=[('B', 'C')]
与:
choices_list=[('B', 'B'), ('C', 'C')]
附注:
阅读有关 django auth 和 request.user 的文档:您可以替换它
e1 = str(request.user)
if e1 == 'AnonymousUser':
do_something()
与
if request.user.is_anonymous():
do_something()
学习使用Python的字符串格式化功能 - 你可以替换这个:
'Welcome '+request.user.first_name + ' :)'
与
'Welcome %s :)' % request.user.first_name
或更好:将演示文稿保留给模板层(它所属的位置)，请记住，使用默认设置，您将可以在模板上下文中访问 request.user ，而无需显式传递它。
学会正确地分解你的代码以避免重复:你将相同的代码块复制粘贴到不同的地方，这充其量是脆弱的(FWIW你已经有一个地方有拼写错误，看看你是否能找到它)。
最后:学习使用 Django 的消息应用程序 ( https://docs.djangoproject.com/en/1.6/ref/contrib/messages/ )，而不是重新发明方轮。
关于python - Django 小部件 : too many values to unpack，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27293831/