使用Django-mailer与Djoser发送激活邮件时遇pickle序列化错误

尝试使用django-mailer发送Djoser用户激活邮件时，触发如下错误：

错误摘要 #

TypeError: cannot pickle '_io.BufferedReader' object

完整报错堆栈 #

Traceback (most recent call last):
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/viewsets.py", line 125, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/mixins.py", line 19, in create
    self.perform_create(serializer)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/djoser/views.py", line 144, in perform_create
    settings.EMAIL.activation(self.request, context).send(to)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/templated_mail/mail.py", line 78, in send
    super(BaseEmailMessage, self).send(*args, **kwargs)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/mail/message.py", line 298, in send
    return self.get_connection(fail_silently).send_messages([self])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/backend.py", line 15, in send_messages
    messages = Message.objects.bulk_create([
                                           ^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/backend.py", line 16, in <listcomp>
    Message(email=email) for email in email_messages
    ^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/db/models/base.py", line 554, in __init__
    _setattr(self, prop, value)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/models.py", line 150, in _set_email
    self.message_data = email_to_db(val)
                        ^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/models.py", line 94, in email_to_db
    return base64_encode(pickle.dumps(email)).decode('ascii')
                         ^^^^^^^^^^^^^^^^^^^
TypeError: cannot pickle '_io.BufferedReader' object
Internal Server Error: /api/auth/users/
Traceback (most recent call last):
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/viewsets.py", line 125, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/rest_framework/mixins.py", line 19, in create
    self.perform_create(serializer)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/djoser/views.py", line 144, in perform_create
    settings.EMAIL.activation(self.request, context).send(to)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/templated_mail/mail.py", line 78, in send
    super(BaseEmailMessage, self).send(*args, **kwargs)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/core/mail/message.py", line 298, in send
    return self.get_connection(fail_silently).send_messages([self])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/backend.py", line 15, in send_messages
    messages = Message.objects.bulk_create([
                                           ^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/backend.py", line 16, in <listcomp>
    Message(email=email) for email in email_messages
    ^^^^^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/django/db/models/base.py", line 554, in __init__
    _setattr(self, prop, value)
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/models.py", line 150, in _set_email
    self.message_data = email_to_db(val)
                        ^^^^^^^^^^^^^^^^
  File "/Users/joaoalbuquerque/pyenv/versions/3.11.0/envs/garvy/lib/python3.11/site-packages/mailer/models.py", line 94, in email_to_db
    return base64_encode(pickle.dumps(email)).decode('ascii')
                         ^^^^^^^^^^^^^^^^^^^
TypeError: cannot pickle '_io.BufferedReader' object

使用的库及版本（Python 3.11） #

"djangorestframework==3.14.0",
"dj-database-url==1.0.0",
"psycopg2-binary==2.9.5",
"django-cors-headers==3.13.0",
"gunicorn==20.1.0",
"pyjwt==2.6.0",
"python-dotenv==0.21.0",
"djoser==2.1.0",
"djangorestframework-simplejwt==4.8.0",
"django-mailer==2.1",

已尝试的解决方案 #

在Djoser的GitHub仓库找到相关issue，但针对django-mailer 2.1版本的解决方案并未生效。

内容的提问来源于stack exchange，提问作者Joao Albuquerque