如何获得 Django 多个 select 表单以将所选项目作为列表传递？

Question

我有一个 Django 应用程序，我在其中使用与登录用户相关的多选和动态选择，但是当我尝试提交表单时，我不断收到以下错误消息：

"TypeError at /masstext.html Field 'id' expected a number but got <QueryDict: {'customers': [''], 'textmessage': ['test'], 'csrfmiddlewaretoken': ['FNawscd4CXqtDWIUrq0Kolq3x6R699lStaykXwxDbtqciJortBm0pTfPWSvvjW7L']}> "

我想让它在用户提交表单时创建一个新的 model 实例，其中包含选定的客户并将消息输入为字段。 我不明白为什么我没有从列表中返回的多选中获得选定客户的列表，而是一个空列表。

下面的代码：

Model：

class Masstext(models.Model):
    profile = models.ForeignKey(Profile, on_delete = models.CASCADE)
    message = models.CharField(max_length = 500, null = True)
    customers = models.CharField(max_length = 1000, null = True)

形式：

class Textform(ModelForm):

    def __init__(self, user, *args, **kwargs):
        super(Textform, self).__init__(*args, **kwargs)
        self.fields['customers'] = forms.ModelChoiceField(
            queryset = Customers.objects.filter(facility__profile__email = user))

    class Meta:
        model = Masstext
        fields = ['customers','message']

看法：

@login_required(login_url="login/") def load_customers(request, *args,
**kwargs):
    msg = ''
    if request.method == 'POST':
        user = request.user
        form = Textform(request.POST)
        if form.is_valid():
            form.save()
        
        else:
            msg = "Fields are not valid"

    else:
        form = Textform(request.user)
    
    context = {'form': form}
    return render(request,'home/masstext.html',context)

模板：

<form action="masstext.html" method="POST">
                        {% csrf_token %}
                        <!-- Form -->
                                    <label for="customers">Select Customers:</label>
                                    <br>
                                    <select name="customers" style="height: 250pt" multiple>
                                      {% for customer in form.customers %}
                                      <option value='{{customer.id}}'{{customer}}></option>
                                      {% endfor %}
                                    </select>
                                    <br><br>
                                    <textarea name="textmessage" rows="4" cols="75" placeholder="Write the text message you'd like to send to all tenants selected above here...">{{customer.message}}</textarea>
                                    <br><br>
                                    <input type="submit" value="Submit"> 
                        </form>
                        <!-- End of Form -->