在我的表单中，我有选择框但是在提交后我在这个字段上收到错误：“选择一个有效的选择。这个选择不是可用的选择之一。”我正在使用其他形式的代码，一切正常，但不是这种形式:(
forms.py：
BLANK_CHOICE = (('', '---------'),)
class ClientCreateForm(forms.ModelForm):
class Meta:
model = Client
fields = ('name', 'address', 'zip_code', 'city', 'country', 'forwarding_address',
'forwarding_zip_code', 'forwarding_city', 'forwarding_country')
def __init__(self, *args, **kwargs):
super(ClientCreateForm, self).__init__(*args, **kwargs)
self.fields['country'].choices = CountriesShortcut.objects.all().values_list('id', 'name')
self.fields['forwarding_country'].choices = BLANK_CHOICE + tuple(
CountriesShortcut.objects.all().values_list('id', 'name'))
的 Models.py
class CountriesShortcut(models.Model):
name = models.CharField(max_length=80, unique=True)
class Meta:
ordering = ['id']
def __init__(self):
self.code
class Client(models.Model):
id = models.OneToOneField(User, on_delete=models.CASCADE, unique=True, primary_key=True)
name = models.CharField(max_length=256, unique=True)
address = models.CharField(max_length=64)
zip_code = models.CharField(max_length=10, help_text='Zip Code')
city = models.CharField(max_length=64)
country = models.ForeignKey(CountriesShortcut, related_name='country', blank=True, null=True)
forwarding_address = models.CharField(max_length=64, blank=True)
forwarding_zip_code = models.CharField(max_length=10, blank=True)
forwarding_city = models.CharField(max_length=64, blank=True)
forwarding_country = models.ForeignKey(CountriesShortcut, related_name='forwarding_country', blank=True, null=True)
def __str__(self):
re = self.name + ' [' + str(self.id) + ']'
return re
你能给我一些建议吗？
更改为查询集后显示跟踪：
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/panel/client/create/
Django Version: 1.8.8
Python Version: 3.5.1
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'core',
'client',
'registration',
'avatar',
'filer',
'mptt',
'easy_thumbnails',
'reversion')
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',
'django.middleware.security.SecurityMiddleware')
Template error:
In template C:\Users\loc\PycharmProjects\CRM\templates\panel\client\form.html, error at line 131
__init__() takes 1 positional argument but 3 were given
121 : <div class="col-sm-3">
122 : {{ form_client.city }}
123 : {% if form_client.errors.city %}
124 : <p class="help-block">
125 : {{ form_client.errors.city }}
126 : {{ form_client.non_field_errors.city }}
127 : </p>
128 : {% endif %}
129 : </div>
130 : <div class="col-sm-3">
131 : {{ form_client.country }}
132 : {% if form_client.errors.country %}
133 : <p class="help-block">
134 : {{ form_client.errors.country }}
135 : {{ form_client.non_field_errors.country }}
136 : </p>
137 : {% endif %}
138 : </div>
139 : </div>
140 : </div>
141 : </div>
Traceback:
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\core\handlers\base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "C:\Users\loc\PycharmProjects\CRM\core\views.py" in client_create
111. return render(request, 'panel/client/form.html', dict)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\shortcuts.py" in render
67. template_name, context, request=request, using=using)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\loader.py" in render_to_string
99. return template.render(context, request)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\backends\django.py" in render
74. return self.template.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in render
210. return self._render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in _render
202. return self.nodelist.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\loader_tags.py" in render
135. return compiled_parent._render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in _render
202. return self.nodelist.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\loader_tags.py" in render
65. result = block.nodelist.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\base.py" in render
905. bit = self.render_node(node, context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\debug.py" in render_node
79. return node.render(context)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\template\debug.py" in render
92. output = force_text(output)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\utils\encoding.py" in force_text
90. s = six.text_type(s)
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\utils\html.py" in <lambda>
399. klass.__str__ = lambda self: mark_safe(klass_str(self))
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\forms\forms.py" in __str__
537. return self.as_widget()
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\forms\forms.py" in as_widget
593. return force_text(widget.render(name, self.value(), attrs=attrs))
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\forms\widgets.py" in render
513. options = self.render_options(choices, [value])
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\forms\widgets.py" in render_options
539. for option_value, option_label in chain(self.choices, choices):
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\forms\models.py" in __iter__
1107. for obj in queryset:
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\db\models\query.py" in iterator
255. obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
File "C:\Users\loc\dJangoEnvironment\lib\site-packages\django\db\models\base.py" in from_db
489. new = cls(*values)
Exception Type: TypeError at /panel/client/create/
Exception Value: __init__() takes 1 positional argument but 3 were given
答案 0 :(得分：1)
您的字段是外键。默认情况下，django将表单中字段的所有可用值设置为模型的所有对象。查看代码，我认为您可以完全删除ClientCreateForm __init__。
如果您仍想设置自定义选项，则不应设置choices属性。您应该使用queryset：
class ClientCreateForm(forms.ModelForm):
# your meta goes here
def __init__(self, *args, **kwargs):
super(ClientCreateForm, self).__init__(*args, **kwargs)
self.fields['country'].queryset = CountriesShortcut.objects.all()
self.fields['forwarding_country'].queryset = CountriesShortcut.objects.all()
您的字段标记为null=True，因此会自动添加空的破折号。
choices，例如，CharField并设置了选择属性。