ValueError异常：没有足够的数值解压缩（预计2，拿到1）

Question

下面是我的代码

views.py

from django.shortcuts import render 
from .forms import MedicineForm 
from .models import Medicine 

def index(request): 
    all_medicine = Medicine.objects.order_by('id') 
    return render(request, 'medicine/index.html', {'all_medicine': all_medicine}) 

def add(request): 
if request.method == 'POST': 
    form = MedicineForm(request.POST) 
    if form.is_valid(): 
     new = Medicine() 
     new.name = form.cleaned_data['药品名称'] 
     new.price = form.cleaned_data['药品价格'] 
     new.number = form.cleaned_data['药品编号'] 
     new.sort = form.cleaned_data['药品分类'] 
     new.unit = form.cleaned_data['计价单位'] 
     new.save() 
     return render(request, 'medicine/index.html') 
else: 
    form = MedicineForm() 
return render(request, 'medicine/add.html', {'form': form},) 

---

forms.py

from django import forms 


class MedicineForm(forms.Form): 
    药品编号 = forms.IntegerField() 
    药品名称 = forms.CharField(max_length=100) 
    药品价格 = forms.IntegerField() 
    jj_choice = { 
     '瓶': '瓶', 
     '包': '包', 
     '盒': '盒', 
    } 
    计价单位 = forms.ChoiceField(
     choices=jj_choice 
    ) 
    药品分类 = forms.CharField(max_length=100) 

---

add.html：

{% extends 'polls/index.html' %} 


{% block medicine_form %} 
<form action="http://localhost:8000/medicine/add/" method="post"> 
    {% csrf_token %} 
    {{ form }} 
    <input type="submit" value="添加药品" /> 
</form> 


{% endblock %} 

---

回溯：

File "E:\p\lib\site-packages\django\core\handlers\exception.py" in inner 39. response = get_response(request)

File "E:\p\lib\site-packages\django\core\handlers\base.py" in _get_response 187. response = self.process_exception_by_middleware(e, request)

File "E:\p\lib\site-packages\django\core\handlers\base.py" in _get_response 185. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "F:\ddjj\x\mysite\medicine\views.py" in add 25. return render(request, 'medicine/add.html', {'form': form},)

File "E:\p\lib\site-packages\django\shortcuts.py" in render 30. content = loader.render_to_string(template_name, context, request, using=using)

File "E:\p\lib\site-packages\django\template\loader.py" in render_to_string 68. return template.render(context, request)

File "E:\p\lib\site-packages\django\template\backends\django.py" in render 66. return self.template.render(context)

File "E:\p\lib\site-packages\django\template\base.py" in render 208. return self._render(context)

File "E:\p\lib\site-packages\django\template\base.py" in _render 199. return self.nodelist.render(context)

File "E:\p\lib\site-packages\django\template\base.py" in render 994. bit = node.render_annotated(context)

File "E:\p\lib\site-packages\django\template\base.py" in render_annotated 961. return self.render(context)

File "E:\p\lib\site-packages\django\template\loader_tags.py" in render 174. return compiled_parent._render(context)

File "E:\p\lib\site-packages\django\template\base.py" in _render 199. return self.nodelist.render(context)

File "E:\p\lib\site-packages\django\template\base.py" in render 994. bit = node.render_annotated(context)

File "E:\p\lib\site-packages\django\template\base.py" in render_annotated 961. return self.render(context)

File "E:\p\lib\site-packages\django\template\loader_tags.py" in render 70. result = block.nodelist.render(context)

File "E:\p\lib\site-packages\django\template\base.py" in render 994. bit = node.render_annotated(context)

File "E:\p\lib\site-packages\django\template\base.py" in render_annotated 961. return self.render(context)

File "E:\p\lib\site-packages\django\template\base.py" in render 1050. return render_value_in_context(output, context)

File "E:\p\lib\site-packages\django\template\base.py" in render_value_in_context 1028. value = force_text(value)

File "E:\p\lib\site-packages\django\utils\encoding.py" in force_text 76. s = six.text_type(s)

File "E:\p\lib\site-packages\django\utils\html.py" in 391. klass.str = lambda self: mark_safe(klass_str(self))

File "E:\p\lib\site-packages\django\forms\forms.py" in str 123. return self.as_table()

File "E:\p\lib\site-packages\django\forms\forms.py" in as_table 271. errors_on_separate_row=False)

File "E:\p\lib\site-packages\django\forms\forms.py" in _html_output 226. 'field': six.text_type(bf),

File "E:\p\lib\site-packages\django\utils\html.py" in 391. klass.str = lambda self: mark_safe(klass_str(self))

File "E:\p\lib\site-packages\django\forms\boundfield.py" in str 43. return self.as_widget()

File "E:\p\lib\site-packages\django\forms\boundfield.py" in as_widget 101. return force_text(widget.render(name, self.value(), attrs=attrs))

File "E:\p\lib\site-packages\django\forms\widgets.py" in render 537. options = self.render_options([value])

File "E:\p\lib\site-packages\django\forms\widgets.py" in render_options 560. for option_value, option_label in self.choices:

Exception Type: ValueError at /medicine/add/ Exception Value: not enough values to unpack (expected 2, got 1)

Answer 1

你

return render(request, 'medicine/add.html', {'form': form},) 

你需要

return render(request, 'medicine/add.html', {'form': form}) 

,末使得它元组

Answer 2

jj_choice = { 
    '瓶': '瓶', 
    '包': '包', 
    '盒': '盒', 
} 

应该写成，

jj_choice = (
    ('瓶', '瓶'), 
    ('包', '包'), 
    ('盒', '盒'), 
) 

键，文本元组。