hi guys,
When I make message flash, somehow genarate a error
AttributeError: 'tuple' object has no attribute 'append'
the source code of flask look like it is a list
session.setdefault('_flashes', []).append((category, message))
When this turn to be a tuple? Why?
Why this happened? And how to make it good?
Thanks.
-------------------------------
linnchord@gmail.com
Hi, On 11/24/11 2:44 AM, linnchord wrote: > When I make message flash, somehow genarate a error > > AttributeError: 'tuple' object has no attribute 'append' Sounds like something in the session backend sets _flashes to a tuple isntead of a list. This can happen if you set this yourself or if you have a session backend that cannot deal with lists and is returning tuples instead. I do not know if such a session system currently exists, but I would not be surprised seeing how msgbuf or whatever it is I was testing last time was randomly converting types around. To debug this issue: 1. Do you use a custom session backend? 2. Do you set _flashes to an empty tuple anywhere? Regards, Armin
Got it! I use msgpack to serialize the session dict, that will turn the list to tuple when load from redis. Sucks! ------------------------------- linnchord@gmail.com 在 2011年11月24日星期四，下午2:30，Armin Ronacher 写道： > Hi, > > On 11/24/11 2:44 AM, linnchord wrote: > > When I make message flash, somehow genarate a error > > > > AttributeError: 'tuple' object has no attribute 'append' > Sounds like something in the session backend sets _flashes to a tuple > isntead of a list. This can happen if you set this yourself or if you > have a session backend that cannot deal with lists and is returning > tuples instead. I do not know if such a session system currently > exists, but I would not be surprised seeing how msgbuf or whatever it is > I was testing last time was randomly converting types around. > > To debug this issue: > > 1. Do you use a custom session backend? > 2. Do you set _flashes to an empty tuple anywhere? > > > Regards, > Armin > >
Why not use flash(message, category)? On Thu, Nov 24, 2011 at 09:44, linnchord <linnchord@gmail.com> wrote: > hi guys, > > When I make message flash, somehow genarate a error > > > AttributeError: 'tuple' object has no attribute 'append' > > > the source code of flask look like it is a list > > > session. > setdefault('_flashes', []).append((category, message)) > > > When this turn to be a tuple? Why? > > Why this happened? And how to make it good? > > Thanks. > > > ------------------------------- > linnchord@gmail.com > >
is that matter? my call code is flash(u'add successful!','ok') ------------------------------- linnchord@gmail.com 在 2011年11月24日星期四，上午10:03，Lix Xu 写道： > Why not use flash(message, category)? > > On Thu, Nov 24, 2011 at 09:44, linnchord <linnchord@gmail.com (mailto:linnchord@gmail.com)> wrote: > > hi guys, > > > > When I make message flash, somehow genarate a error > > AttributeError: 'tuple' object has no attribute 'append' > > > > the source code of flask look like it is a list > > session. setdefault('_flashes', []).append((category, message)) > > > > When this turn to be a tuple? Why? > > Why this happened? And how to make it good? > > Thanks. > > > > > > ------------------------------- > > linnchord@gmail.com (mailto:linnchord@gmail.com) > > >