您好，我的自定义验证正在抛出一个类型错误，表示IsubClass（）arg 1必须是一个类

Question

嗨，我添加了自定义验证。它抛出一个类型错误，表示issubclass（）arg 1必须是一个类。和我的代码在管理。py是

class AppraisalScheduleAdmin(admin.ModelAdmin):
    exclude = ['intUpdatedBy']
    form = 'tbmstappraisalschedForm'

        def save_model(self, request, obj, form, change):
            obj.intUpdatedBy = request.user.id
            obj.save()

class tbmstappraisalschedForm(forms.ModelForm):

     def clean(self):
          """ 
          Override the default clean method to check whether this course has been already inputted.
          """    
          cleaned_data = super(tbmstappraisalschedForm, self).clean()
          depart_id = cleaned_data.get('intDeptID')
          fromdate = cleaned_data.get('sdtFromDate')
          todate = cleaned_data.get('todate')
          matching_records = tbmstappraisalsched.objects.filter(intDeptID=depart_id)
          if self.instance:
              matching_records.exclude(pk=self.instance.pk)
          if matching_records.exists():
              msg = "The slot for selected department and selected dates exists" % name
              raise ValidationError(msg)
          else:
              return self.cleaned_data
    class Meta:
        model = tbmstappraisalsched

回溯是

回溯：get\u响应103中的文件“C:\Python27\lib\site packages\django\core\handlers\base.py”。解析程序\匹配=解析程序。在resolve 319中解析（request.path_info）文件“C:\Python27\lib\site packages\django\core\urlresolvers.py”。对于自我的模式。url_模式：url_模式347中的文件“C:\Python27\lib\site packages\django\core\urlresolvers.py”。patterns=getattr（self.urlconf_模块，“urlpatterns”，self.urlconf_模块）文件“C:\Python27\lib\site packages\django\core\urlresolvers.py”，位于urlconf_模块342中。自我_urlconf_module=import_module（self.urlconf_name）文件“C:\Python27\lib\site packages\django\utils\importlib.py”，位于import_模块35中。在5中导入（名称）文件“C:\pythonprgs\opas\opas\url.py”。管理autodiscover（）文件“C:\Python27\lib\site packages\django\contrib\admin\uuuuu init\uuuuu.py”位于autodiscover 29中。在导入模块35中导入模块（“%s.admin”%app）文件“C:\Python27\lib\site packages\django\utils\importlib.py”。在60中导入（名称）文件“C:\pythonprgs\opas\schdeules\admin.py”。管理地点在寄存器98中注册（tbmstappraisalsched，evaluationscheduleadmin）文件“C:\Python27\lib\site packages\django\contrib\admin\sites.py”。验证（admin_类，模型）文件“C:\Python27\lib\site packages\django\contrib\admin\validation.py”，位于validate 25中。验证\u base 317中的验证\u base（cls，模型）文件“C:\Python27\lib\site packages\django\contrib\admin\validation.py”。如果hasattr（cls，“form”）而不是issubclass（cls.form，BaseModelForm）：

异常类型：TypeError at /admin/schdeules/tbmstappraisalsched/add/异常值：issubclass（）arg 1必须是一个类

Answer 1

请参阅下面的管理员代码。派克

    from .forms import tbmstappraisalschedForm 
    class AppraisalScheduleAdmin(admin.ModelAdmin):
        exclude = ['intUpdatedBy']
    #    form = 'tbmstappraisalschedForm'  you can not pass a string  here .
         form = tbmstappraisalschedForm     #do like this