On Mon, 2010-11-29 at 22:31 +0100, Matthias Müller wrote:
> Hello,
>
> I have a simple messageboard using SQLalchemy and URL-Dispatching.
>
> The __init__.py holds a line:
>
> config.add_route('home', '/', view='bp2.message.start',
> view_renderer='templates/start.pt')
>
> The important part of message.py is:
>
> def start(request):
> session = DBSession
> messages = session.query(Message).order_by(desc(Message.datetime))[-10:]
> return {'messages':messages}
>
> The important part of the template is:
>
> <span tal:repeat="m messages">
> <div id="message">
> <div id="subject" tal:content="m.subject">Subject</div>
> <div id="text" tal:content="m.text">Text</div>
> <div id="datetime" tal:content="m.datetime.strftime('%d.%m.%Y %H:%M:
> %S')">Datetime</div>
> <div id="userid" tal:content="m.userid">UserID</div>
> </div>
> </span>
>
> This works, but I'd like to put out the date string not only in the format
> shown above. I want to use strings like "yesterday", "a week ago" etc.
>
> How can I do that ?
>
> I've tried to use a python function in the template:
>
> <div id="mdatetime"
> tal:content="python:bp2/message/dateformat(m.datetime)">Datetime</div>
>
> I extended the message.py by the function dateformat:
>
> def dateformat(str):
> result = 'yesterday' # dummy, here's more code
> return result
>
> The error I get looks like this:
>
> RuntimeError: Caught exception rendering template.
> - Expression: ``bp2/message/dateformat(m.datetime)``
> - Filename: /home/mm/pyramid/bp2/bp2/templates/start.pt
> - Arguments: renderer_name: templates/start.pt
> template: <PageTemplateFile - at 0xae012ac>
> xincludes: <XIncludes - at 0xae01eec>
> macros: <Macros - at 0xae0e9cc>
> request: <Request - at 0xadfefac>
> messages: <list - at 0xae01a8c>
> renderer_info: {...} (2)
> context: <instance None at 0xadfefcc>
> view: <function start at 0xadf9b8c>
>
> NameError: bp2
> ----------------------------------------
>
> What is the best practise. I pylons there were helpers
>
> Thanks for your help
> Matthias
>
You have two problems:
1. You are expecting an object named "bp2" to somehow be available in
the template. Not sure why you expect this, given that your view
doesn't pass it in.
2. Even if it was made available by your view, you are trying to use
"path syntax" (python:bp2/message/dateformat(m.datetime)), which
Chameleon-ZPT does not support in Pyramid. Instead, you want
tal:content="<somepythonepxression>" where somepythonexpression might be
e.g. "some.module.dateformat(m.datetime)".
- C
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