Python 覆盖django管理的正确方法'；s add_view（）

我需要覆盖django admin中的视图

add_view（）

，每当我尝试添加新模型实例时都会调用该视图

我所尝试的：

class BaseMarketModelAdmin(admin.ModelAdmin):
    def save_model(self, request, obj, form, change):
        obj.creator = request.user
        return super().save_model(request, obj, form, change)

    def add_view(self, request, form_url='', extra_context=None):
        try:
            super(BaseMarketModelAdmin, self).add_view(
                request, form_url, extra_context
            )
        except ValidationError as e:
            return handle_exception(self, request, e)

    def change_view(self, request, object_id, form_url='', extra_context=None):
        try:
            return super(BaseMarketModelAdmin, self).change_view(
                request, object_id, form_url, extra_context
            )
        except ValidationError as e:
            return handle_exception(self, request, e)

change\u view（）

可以正常工作，但当我尝试使用django admin中的“add ModelName”按钮添加新模型实例时，总是会出现以下异常：

AttributeError at /admin/market/exchange/add/
'NoneType' object has no attribute 'has_header'
Request Method: GET
Request URL:    http://127.0.0.1:8000/admin/market/exchange/add/
Django Version: 3.0.3
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'has_header'
Exception Location: /usr/local/lib/python3.7/site-packages/django/utils/cache.py in patch_response_headers, line 243
Python Executable:  /usr/local/bin/python
Python Version: 3.7.7

AttributeError at /admin/market/exchange/add/
'NoneType' object has no attribute 'COOKIES'
Request Method: GET
Request URL:    http://127.0.0.1:8000/admin/market/exchange/add/
Django Version: 3.0.3
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'COOKIES'
Exception Location: /usr/local/lib/python3.7/site-packages/django/middleware/csrf.py in _get_token, line 170
Python Executable:  /usr/local/bin/python
Python Version: 3.7.7

我试着检查django的

add_view（）

的源代码，它位于：中，似乎只调用

change_view（）

，没有对象id。然后我尝试了以下方法：

def add_view(self, request, form_url='', extra_context=None):
    return self.changeform_view(request, None, form_url, extra_context)

def add_view(self, request, form_url='', extra_context=None):
    return BaseMarketModelAdmin.changeform_view(request, None, form_url, extra_context)

并且它正确加载新实例页面，但不调用my

BaseMarketModelAdmin.change\u view（）

view

然后我试了一下：

def add_view(self, request, form_url='', extra_context=None):
    return self.changeform_view(request, None, form_url, extra_context)

def add_view(self, request, form_url='', extra_context=None):
    return BaseMarketModelAdmin.changeform_view(request, None, form_url, extra_context)

但它导致了这一例外：

AttributeError at /admin/market/exchange/add/
'NoneType' object has no attribute 'has_header'
Request Method: GET
Request URL:    http://127.0.0.1:8000/admin/market/exchange/add/
Django Version: 3.0.3
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'has_header'
Exception Location: /usr/local/lib/python3.7/site-packages/django/utils/cache.py in patch_response_headers, line 243
Python Executable:  /usr/local/bin/python
Python Version: 3.7.7

AttributeError at /admin/market/exchange/add/
'NoneType' object has no attribute 'COOKIES'
Request Method: GET
Request URL:    http://127.0.0.1:8000/admin/market/exchange/add/
Django Version: 3.0.3
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'COOKIES'
Exception Location: /usr/local/lib/python3.7/site-packages/django/middleware/csrf.py in _get_token, line 170
Python Executable:  /usr/local/bin/python
Python Version: 3.7.7

---

现在我需要覆盖

add_view（）

view。正确的方法是什么？

在

add\u view

方法中缺少返回值

    def add_view(self, request, form_url='', extra_context=None):
    try:
        return super(BaseMarketModelAdmin, self).add_view(
            request, form_url, extra_context
        )
    except ValidationError as e:
        return handle_exception(self, request, e)

---

我可以问一下您想如何处理

添加视图（…）

？@Arakkal我需要手动处理可能引发的异常。与change_view（）完全一样，验证也在add_view（…）中管理，不是吗？正确！我不知道我到底怎么会犯这样的错误！！