Python 在模板中呈现表单时发生ValueError

好的，这是第三天搜索这个错误的解决方案，所以我想在这里问一下

我知道还有其他问题与我的问题类似，但显然所有其他问题都有另一个原因。 这是我的设置： Django版本：2.1.5 Python版本：3.7.1

我的错误是：

ValueError位于/testsel

要解压缩的值太多（预期为2个）

这是我的回溯：

Traceback (most recent call last):
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/ricardo/Projects/Organizacional/organizacional/home/views.py", line 36, in testsel
    return render(request,'home/testsel.html',{ 'form':form })
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/shortcuts.py", line 36, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 171, in render
    return self._render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 993, in render
    return render_value_in_context(output, context)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/template/base.py", line 972, in render_value_in_context
    value = str(value)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/utils/html.py", line 397, in <lambda>
    klass.__str__ = lambda self: mark_safe(klass_str(self))
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 142, in __str__
    return self.as_table()
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 284, in as_table
    errors_on_separate_row=False,
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 202, in _html_output
    top_errors = self.non_field_errors()  # Errors that should be displayed above all fields.
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 313, in non_field_errors
    return self.errors.get(NON_FIELD_ERRORS, self.error_class(error_class='nonfield'))
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 180, in errors
    self.full_clean()
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 381, in full_clean
    self._clean_fields()
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/forms.py", line 393, in _clean_fields
    value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/forms/widgets.py", line 648, in value_from_datadict
    return getter(name)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/query.py", line 390, in get
    clone = self.filter(*args, **kwargs)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/query.py", line 844, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/query.py", line 862, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1263, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1287, in _add_q
    split_subq=split_subq,
  File "/home/ricardo/anaconda3/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1161, in build_filter
    arg, value = filter_expr
ValueError: too many values to unpack (expected 2)

这是在forms.py中定义的表单：

class SelectTest(forms.Form):
    def __init__(self, *args, **kwargs):
        super(SelectTest,self).__init__(*args,**kwargs)
        CHOICES=args[0].values('sigla')
        CHOICES=[(s['sigla'],s['sigla'].lower()) for s in CHOICES]
        self.fields['select']=forms.ChoiceField(widget=forms.Select(),choices=CHOICES)

这是我的模板：

{% block content %}
<form action="" method="post">{% csrf_token %}
    {{ form }} 
  <button type="submit">Enviar</button>
</form>
{% endblock content %}

现在，如果我将模板更改为：

{% for field in form %}
    {{ field.select }}
{% endfor %}

它呈现时没有错误，但表单未呈现，或显示在“查看源”处。如果我只在循环中使用

字段

，我又回到了“太多的值需要解包”

我知道我需要在choices上传递一个元组列表，这就是它正在做的事情。我已经检查了三遍了

---

感谢您的帮助。

表单的第一个参数是绑定表单的数据。您将在那里传递一个查询集，并立即将其传递给导致错误的超类

如果要向表单传递额外数据，应始终使用关键字参数，并在调用super之前将其从kwargs dict中删除

form=SelectTest(sigla=Tests.objects.all())

---

注意，您可能应该使用ModelChoiceField（它直接接受查询集），而不是简单的ChoiceField。

表单的第一个参数是绑定表单的数据。您将在那里传递一个查询集，并立即将其传递给导致错误的超类

如果要向表单传递额外数据，应始终使用关键字参数，并在调用super之前将其从kwargs dict中删除

form=SelectTest(sigla=Tests.objects.all())

---

注意，您可能应该使用ModelChoiceField（直接接受查询集），而不是简单的ChoiceField。

Beaultifull！非常感谢你！美丽！非常感谢你！

form=SelectTest(sigla=Tests.objects.all())

class SelectTest(forms.Form):
    def __init__(self, *args, **kwargs):
        sigla = kwargs.pop('sigla', None)
        super(SelectTest,self).__init__(*args,**kwargs)