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Editorial Team
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Asked: 2026-05-28T00:32:08+00:00

Whenever I POST a form, I display error messages. However, the way I add

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Whenever I POST a form, I display error messages. However, the way I add flashes to the queue, some messages stay after I POST to the form, and some don’t. I noticed that it’s due to the way I add messages to the queue.

The regular way that works perfectly:

post_data = request.POST
if 'submit' in post_data:
    ... function(post_data) ...
    if ...:
        request.session.flash(u'This is some error message')
    request.session.flash(u'Maybe some other error message')

And in the mako file:

<html>...<body>...
% for m in request.session.pop_flash():
  <div class="alert-message">
    <p>${m}</p>
  </div>
% endfor
...</body></html>

However, the way I want some of the messages to work is:

if 'submit' in post_data: 
    messages = function(...) # output is always a list
    for m in messages:
        request.session.flash(m)

When I do that, every time I rePOST to the same form, ALL the previous messages are added to the .flash() again. Thus, the error messages just keep piling. How do I fix this or work around this?

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1 Answer

  1. Editorial Team

    I figured out the problem, but I’m not sure why it happened. Before, I initiated message as a keyword:

    @classmethod
def validate(cls, message=[], **kwargs):
    if this:
        message.append(u'...')
    return kwargs, message

    I believe that after each POST, message didn’t clear even though I never called validate() with it. However, when I removed messsage as a keyword, it works fine:

    @classmethod
def validate(cls, **kwargs):
    message = []
    ...

    Anyone know why this is the case?

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