django表单错误：“选择不是可用选项之一”

问题描述：

我有2个应用程序。django表单错误：“选择不是可用选项之一”

输入：具有包含下拉列表的区域：区域。下拉列表值来自结果数据库（由用户上传）。填写表格时，用户需要从下拉列表中选择值。

结果：对数据库

现在我可以显示下拉列表从输入表格“输入”应用程序的数据库。（如图所示）。

我现在面临的问题是，选择的选择，并提交后，出现如下图所示的错误：

错误显示像：选择一个有效的choice.The选择没有之一可用的选择。然后我不明白为什么，因为我确实从下拉列表中选择了选项。

在此先感谢您的帮助，指出问题所在。

models.py

from django import forms 
from django.forms import ModelForm 
from django.db import models 
from dupont.models import Result 
from datetime import date 
from django.forms import widgets 

class Input(models.Model): 
    company=models.CharField(max_length=100) 
    region=models.CharField(max_length=100) 

    def __unicode__(self): 
     return self.company

forms.py

from django import forms 
from django.forms import ModelForm 
from .models import Input 
from dupont.models import Result 
from django.contrib.auth.models import User,Group 
from django.forms import widgets 
from functools import partial 
from django.forms.utils import ErrorList 

class InputForm(forms.ModelForm): 
    company=forms.CharField(widget=forms.TextInput, label="Company",error_messages={'required': 'Please enter the company name'},required=True) 
    region = forms.ModelChoiceField(queryset=Dupont.objects.values('region').distinct(),widget=forms.Select(),empty_label="(Global)",to_field_name="supply_chain") 
    error_css_class='error' 
    required_css_class = 'required' 

    class Meta: 
     model = Input 
     fields = ('company', 'region')

views.py

from django.http import HttpResponseRedirect 
from django.shortcuts import render,render_to_response,get_object_or_404 
from inputform.forms import InputForm 
from inputform.models import Input 
from dupont.models import Result 
from django.views.decorators.csrf import csrf_exempt 
from django.views.generic.list import ListView 
from django.contrib import messages 
from django.template import RequestContext 
from django.shortcuts import redirect 

@csrf_exempt 
def input(request): 
    if request.method == 'POST': 
     form = InputForm(request.POST) 
     if form.is_valid(): 
      company = form.cleaned_data['company'] 
      region = form.cleaned_data['region'] /Is this one correct? 
      form.save() 
      return redirect('result') 
     else: 
      print form.errors 

    else: 
     form=InputForm() 
    return render_to_response('inputform.html',{'form': form},context_instance=RequestContext(request))

HTML

<form method="post" action="{% url 'input' %}"> 
     {% csrf_token %} 

     <!--company--> 
     <div class="field"> 
      {{ form.company.errors }} 
      <label for="{{ form.company.id_for_label }}">Company:</label> 
      {{ form.company }} 
     </div> 

     <!--Region--> 
     <div class="field" > 
      <label> Select the Region: 
      {{ form.region }} 
       {% for region in form.region.choices %} 
        <option value="region" name= "region" id="id_region">{{region}} </option> 
       {% endfor %} 
      </label> 
     </div> 

     <!--submit--> 
     <div class="fieldWrapper"> 
     <p><input type="submit" value="Submit" /></p></div> 

</form>

答

谢谢你的职位：django forms give: Select a valid choice. That choice is not one of the available choices

我

iquery = Result.objects.values_list('region', flat=True).distinct() 
iquery_choices = [('', 'None')] + [(region,region) for region in iquery] 
region = forms.ChoiceField(iquery_choices,required=False, widget=forms.Select())

改变取代了以往

region=forms.ModelChoiceField(queryset=Dupont.objects.values('region').distinct(),widget=forms.Select())"

，然后它的作品。但我不明白为什么，希望有人能解释。

django表单错误：“选择不是可用选项之一”

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