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当我创建一个新公司时，我可以添加用户而不会出现任何错误。但是，当我尝试更新公司时，我选择了默认用户已经使用initialwith 字段（我不确定这是一个好方法）。我收到此错误

选择一个有效的选项。3 不是可用的选择之一

我认为我的默认选择方法不好。

模型.py

class CustomUser(models.Model):

   username = models.CharField(max_length=20)
   ...<fields>....
   firm = models.ForeignKey(
             'Firm',
             null = True,
             blank = True,
             on_delete = models.Set_NULL,
             related_name = 'users'
          )

class Firm(models.Model):

   firm_name = models.CharField(max_length=20)
   .....<fields>.....

表格.py

class FirmAdminForm(forms.ModelForm):

    users = forms.ModelMultipleChoiceField(
                widget = FilteredSelectMultiple('username', is_stacked=False),
                queryset=User.objects.exclude(is_staff=True).filter(firm=None),
                required=False,
            )

    class Meta:
        model = Firm,
        fields = [...<other fields>, 'users']

    def save(self, commit=True):
        # Save the provided password in hashed format
        firm = super().save(commit=False)
        users = self.cleaned_data['users']
        firm.users.set(users)
        return firm

管理员.py

class FirmAdmin(admin.ModelAdmin):

    form = FirmAdminform
    ...other codes .....


    def render_change_form(self, request, context, add, change, form_url, obj):
        users = SalesToolUser.objects.exclude(is_staff=True).filter(partner_firm=None)
        if obj:
            partner_agents = obj.users.all()
            users = User.objects.exclude(is_staff=True).filter(Q(firm=None)|Q(firm=obj)) 
            context['adminform'].form.fields['users'].initial = partner_agents

        context['adminform'].form.fields['users'].queryset = users
        return super().render_change_form(request, context, add=add, change=change, form_url=form_url, obj=obj)
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