python - Django Form Error : Select a valid choice. ...不是可用选项之一

Question

我正在尝试创建一个动态选择字段。我有一个创建元组列表的 View 。元组的第一个值是对象 ServiceWriter 的主键，而第二个值是 ServiceWriter 的名称。然后该列表被传递到表单类中。当我进行选择并提交页面时，表单被确定为无效，并且在 shell 中打印以下表单错误:“选择一个有效的选择。(元组的第一个值。即 1,2,3..)是不是可用的选择之一。”

forms.py

class CreateAdvancedRO(forms.Form):
service_writer = forms.ChoiceField()

def __init__(self, writer_choices, *args, **kwargs):
    super(CreateAdvancedRO, self).__init__(*args, **kwargs)
    self.fields['service_writer'].choices = writer_choices
    self.helper = FormHelper()
    self.helper.form_id = 'id-create-advanced-ro'
    self.helper.form_method = 'post'
    self.helper.add_input(Submit('submit', 'Open Repair Order'))

注意:我没有使用 ModelForm。

views.py
class CreateAdvancedRO(View):                                                                    
form_class = CreateAdvancedRO                                                                
writer_form = CreateServiceWriter                                                            
add_line_form = AddJobLine                                                                   

def post(self, request):                                                                     
    writer_choices = []                                                                      
    form = self.form_class(writer_choices, request.POST)                                     
    print(form.errors)                                                                       
    if form.is_valid():                                                                      
        '''Do something'''                        
    else:                                                                                                                                                                       
        writer_choices = []                                                                  
        try:                                                                                 
            writers = ServiceWriter.objects.filter(user=request.user)                        
            for writer in writers:                                                           
                writer_choices.append((str(writer.id), writer.name))                         
        except ObjectDoesNotExist:                                                           
            pass                                                                             
        form = self.form_class(writer_choices, request.POST)                                 
        writer_form = self.writer_form()                                                     
        add_line_form = self.add_line_form()                                                 
        return render(request, 'free/advanced_create.html', {'form': form, 'writer_form': wri
                                                             'add_line_form': add_line_form})

我在 View 中尝试了以下两种方法:

writer_choices.append((str(writer.id), writer.name)) and
writer_choices.append((writer.id, writer.name))

这里是 ServiceWriter 模型，以防万一。

class ServiceWriter(models.Model):
user = models.ForeignKey(User)
name = models.CharField(max_length=20, blank=False)

def __str__(self):
    return str(self.name)

有什么想法吗？感谢您的帮助。

Answer 1

看起来您正在尝试根据一个空的选择列表来验证表单。在实例化或尝试验证表单之前，您是否尝试过填充 writer_choices？