Upon a successful login, I save the user object (from query) to the session dictionary.
登录成功后,我将用户对象(从查询中)保存到会话字典中。
When I try to access an attribute of the object in my Jinja template, I get an error.
当我尝试在Jinja模板中访问对象的属性时,出现错误。
Below are the codes for the affected parts:
以下是受影响部分的代码:
Python "views.py" file:
Python“views.py”文件:
session['in_session'] = True
session['active_user'] = user
Jinja2 "base.html" file:
Jinja2“base.html”文件:
{% if session.in_session %}
<li><a href="">Signed in as {{session.active_user.username|safe|title}}!</a></li>
{%endif%}
EDIT-1:
Here's the error traceback:
编辑-1:这是错误追溯:
TypeError
TypeError: is not JSON serializable Traceback (most recent call last)
TypeError:不是JSON可序列化的Traceback(最近一次调用最后一次)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1479, in full_dispatch_request
response = self.process_response(response)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 1693, in process_response
self.save_session(ctx.session, response)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/app.py", line 837, in save_session
return self.session_interface.save_session(self, session, response)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/sessions.py", line 326, in save_session
val = self.get_signing_serializer(app).dumps(dict(session))
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/itsdangerous.py", line 537, in dumps
payload = want_bytes(self.dump_payload(obj))
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/itsdangerous.py", line 809, in dump_payload
json = super(URLSafeSerializerMixin, self).dump_payload(obj)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/itsdangerous.py", line 522, in dump_payload
return want_bytes(self.serializer.dumps(obj))
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/sessions.py", line 85, in dumps
return json.dumps(_tag(value), separators=(',', ':'))
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/json.py", line 126, in dumps
rv = _json.dumps(obj, **kwargs)
File "/usr/lib/python2.7/json/__init__.py", line 250, in dumps
sort_keys=sort_keys, **kw).encode(obj)
File "/usr/lib/python2.7/json/encoder.py", line 209, in encode
chunks = list(chunks)
File "/usr/lib/python2.7/json/encoder.py", line 434, in _iterencode
for chunk in _iterencode_dict(o, _current_indent_level):
File "/usr/lib/python2.7/json/encoder.py", line 408, in _iterencode_dict
for chunk in chunks:
File "/usr/lib/python2.7/json/encoder.py", line 442, in _iterencode
o = _default(o)
File "/home/acetakwas/web_dev/flask/flask_venv/lib/python2.7/site-packages/flask/json.py", line 83, in default
return _json.JSONEncoder.default(self, o)
File "/usr/lib/python2.7/json/encoder.py", line 184, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: <User 2: u'tak'; u'ace@tak.was'> is not JSON serializable
EDIT-2:
I've just figured that the issue is with storing the user object returned from my query as a dictionary value. So assuming I have a User class which extends Model (from the SQLAlchemy library), doing something like this will fail:
编辑-2:我刚刚想到的问题是将从我的查询返回的用户对象存储为字典值。假设我有一个扩展Model的User类(来自SQLAlchemy库),做这样的事情将会失败:
session['active_user'] = User.query.filter_by(username='my_user_name').first()
Why is that?
这是为什么?
1 个解决方案
#1
It would be helpful to post errors you are encountering. But if I had to guess, you stated session is a dict. In your code you are accessing session like an object. You should be able to simply do:
发布您遇到的错误会很有帮助。但是,如果我不得不猜测,你说会话是一个字典。在您的代码中,您将像对象一样访问会话。你应该能够做到:
{{session['active_user'].username|safe|title}}
#1
It would be helpful to post errors you are encountering. But if I had to guess, you stated session is a dict. In your code you are accessing session like an object. You should be able to simply do:
发布您遇到的错误会很有帮助。但是,如果我不得不猜测,你说会话是一个字典。在您的代码中,您将像对象一样访问会话。你应该能够做到:
{{session['active_user'].username|safe|title}}