为什么我在上传图片时遇到异常错误：“Field”对象没有属性“__dir__”

Question

我最近将我的 web2py 版本“升级”到最新版本（2.27.1），但我忘记了以前的版本。我在管理页面上进行了升级，方法是在 pythonanywhere.com 上托管的实时应用程序上单击标有“检查升级”的按钮。现在，当我尝试提交具有上传属性的表单时，突然出现以下错误：Field 对象没有属性“_ _ dir _ _”。不知何故，图像上传功能已被中断。在此之前web2py升级上传工作正常。有没有办法解决这个问题，下面是我从这个错误中得到的回溯和一些错误详细信息。如果我可以提交更多信息来帮助我的请求，请告诉我。

追溯

Field('logo', 'upload', label=SPAN('Your company logo'))

函数参数列表

Traceback (most recent call last):
  File "/home/myapp/web2py/gluon/restricted.py", line 219, in restricted
    exec(ccode, environment)
  File "/home/myapp/web2py/applications/init/controllers/default.py", line 920, in <module>
  File "/home/myapp/web2py/gluon/globals.py", line 463, in <lambda>
    self._caller = lambda f: f()
  File "/home/myapp/web2py/applications/init/controllers/default.py", line 315, in business_registration
    if form.process().accepted:
  File "/home/myapp/web2py/gluon/html.py", line 2410, in process
    self.validate(**kwargs)
  File "/home/myapp/web2py/gluon/html.py", line 2349, in validate
    if self.accepts(**kwargs):
  File "/home/myapp/web2py/gluon/sqlhtml.py", line 2132, in accepts
    source_file, original_filename, field.uploadfolder
  File "/home/myapp/web2py/gluon/packages/dal/pydal/objects.py", line 2075, in store
    self._tablename if '_tablename' in self.__dir__() and self._tablename else 'no_table',
AttributeError: 'Field' object has no attribute '__dir__'

代码清单

filename='Kivy Documentation.pdf', path='/home/myapp/web2py/applications/init/static/business_docs')

在文件中：/home/myapp/web2py/applications/init/controllers/appadmin.py

        m = re.search(REGEX_UPLOAD_EXTENSION, filename)
        extension = m and m.group(1) or "txt"
        uuid_key = self._db.uuid().replace("-", "")[-16:] if self._db else uuidstr()
        encoded_filename = to_native(base64.urlsafe_b64encode(to_bytes(filename)))
        newfilename = "%s.%s.%s.%s" % (
            self._tablename if '_tablename' in self.__dir__() and self._tablename else 'no_table',
            self.name,
            uuid_key,
            encoded_filename,
        )

我认为你必须使用

"/home/myapp/web2py/applications/init/controllers/appadmin.py", line 7>

Answer 1

__dir__

。所以这个

__dir__()应更改为以下一项：

self._tablename if '_tablename' in self.__dir__() and self._tablename else 'no_table',