我正在尝试为我的customUser模型的所选用户创建版本表单，但不幸的是，这是我在获取表单时获得的：
ValueError at /changeCustomUser/ too many values to unpack
跟踪我的模板和视图文件 - 我会在代码错误位置标记。
models.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'
forms.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')
views.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))
changeCustomUser.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 %}
就像你看到的那样，我在＆＃34;角色＆＃34;中设置了我自己的特权。字段和不同的角色可以执行不同的更改。回到问题： 我尝试通过从上一个视图传递变量来切换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
这帮助我至少显示了我选择更改的用户的正确数据。可悲的是 - 用户切换只持续到我点击POST，因为丢失了这个传递的参数，具有与上面相同的错误结果（解压缩的值太多）。我设法得到的只是编辑记录的用户而不是我选择编辑的用户。 我当然试图弄清楚为什么这些值是错误的，但网络搜索只确认它们需要保持元组格式，因此选择小部件可以处理它们。 任何想法如何使用＆＃39; A＆＃39; B＆＃39;作用
编辑：我的不好。对不起，因为不小心。我上面说的是元组，但没有提供元组。我就像你说的那样得到了他们：
choices_list=[('A','A'), ('B','B'), ('C', 'C')]
单个choices_list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 - 下面是完整的追溯：
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
答案 0 :(得分：4)
请发布完整回溯 - 但我怀疑你的问题出在这一行：
choices_list=[('A', 'B', 'C')]
选择列表应该是(value, label)对的序列（列表或其他）。将以上内容替换为：
choices_list=[('A','A'), ('B','B'), ('C', 'C')]
以及此（它被解释为具有值＆＃39; B＆＃39;和标签＆＃39; C＆＃39;）的单个选项列表：
choices_list=[('B', 'C')]
使用：
choices_list=[('B', 'B'), ('C', 'C')]
作为旁注：
阅读有关django auth和request.user的文档：您可以替换此
e1 = str(request.user)
if e1 == 'AnonymousUser':
do_something()
带
if request.user.is_anonymous():
do_something()
学习使用python的字符串格式化功能 - 您可以替换它：
'Welcome '+request.user.first_name + ' :)'
与
'Welcome %s :)' % request.user.first_name
或更好：将演示文稿留给模板图层（它所属的位置），请记住，使用默认设置，您可以在模板的上下文中访问request.user，而无需明确说明通过它。
学会正确地考虑你的代码以避免重复：你在不同的地方复制粘贴了相同的代码块，这最多是脆弱的（FWIW你已经有一个拼写错误的地方，看看你是否能找到它）。
最后：学会使用Django的消息应用程序（https://docs.djangoproject.com/en/1.6/ref/contrib/messages/），而不是重新发明方形轮。
答案 1 :(得分：0)
最后 - 我赢了那场战斗。
在我之前的建筑中没有权利正常工作。
首先 - 我需要在我的POST request.method“if”阻止中创建变量“choices_list”。这是clou。然后我才能创建我的customUserChangeForm，在构造函数中添加一个参数：
customUserChangeForm = CustomUserChangeForm(choices_list, request.POST, instance=sub_user)
最后要做的是将正在编辑的用户的用户名从GET参数传递给此“if”，并将sub_user的实例用于正确的用户名并匹配当然正确的choices_list值。
再次感谢您的帮助和提示。
PS错误回溯并不是真正具体，并且实际上指向了views.py文件中的错误位置。