Re: 500 Error when using Mako as a templating engine

[wesley chun]

just in case anyone has these problems switching from Kid to Mako and
are searching the archives...

1. the Mako code is fixed now, so you can have just one single
directory in the mako.directories list. for example, my app.cfg now
has:
:
mako.directories=['templates']
:

2. another problem that people have is that in your controller, your
@expose decorator call tends to have more of a "full-path" to the
template when porting from Kid, i.e.,

@expose(template="tghello.templates.hello")
def hello(self):
:

when switching to Mako, because of your mako.directories list, you no
longer have to give the entire path, meaning that the failures are
happening because it's trying to find that full name as a template
file name, which isn't going to work. so for my example above,
visiting http://localhost:8080/hello still fails with the same error,
and it wasn't until i changed my @expose() argument to the below that
i got it to work:

@expose(template="hello")
def hello(self):
:

hope this helps someone eventually!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
http://corepython.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


On Jan 10, 7:00 am, "qazumat...@gmail.com" <qazumat...@gmail.com>
wrote:
> Figured it out.
>
> mako.directories in app.cfg MUST have more then one directory in it.
>
> The bug lies in Mako's code, sometimes the directories property is
> treated as a list with more then one string in it, sometimes it is
> treated as a list with any number of strings in it.
>
> On Jan 9, 3:22 pm, "qazumat...@gmail.com" <qazumat...@gmail.com>
> wrote:
>
> > I did an "easy_install mako" on a Windows machine with TG already
> > installed and working.
>
> > My code for my controllers.py is simply:
> > from turbogears import controllers, expose, flash
> > from turbogears importidentity, redirect
> > from cherrypy import request, response
>
> > class Root(controllers.RootController):
> > @expose(template="mako:makotest.templates.test")
> > def index(self):
> > return dict()
>
> > There is a file makotest\templates\test.mak. When I do python start-
> > makotest.py, everything runs ok until I connect and then I get the
> > following traceback:
>
> > 500 Internal error
> > The server encountered an unexpected condition which prevented it from
> > fulfilling the request.
>
> > Page handler: <bound method Root.index of <smqt.controllers.Root
> > object at 0x01391B10>>
> > Traceback (most recent call last):
> > File "c:\python25\lib\site-packages\cherrypy-2.2.1-py2.5.egg\cherrypy
> > \_cphttptools.py", line 105, in _run
> > self.main()
> > File "c:\python25\lib\site-packages\cherrypy-2.2.1-py2.5.egg\cherrypy
> > \_cphttptools.py", line 254, in main
> > body = page_handler(*virtual_path, **self.params)
> > File "<string>", line 3, in index
> > File "c:\python25\lib\site-packages\TurboGears-1.0.3.2-py2.5.egg
> > \turbogears\controllers.py", line 344, in expose
> > *args, **kw)
> > File "<string>", line 5, in run_with_transaction
> > File "c:\python25\lib\site-packages\TurboGears-1.0.3.2-py2.5.egg
> > \turbogears\database.py", line 312, in so_rwt
> > retval = func(*args, **kw)
> > File "<string>", line 5, in _expose
> > File "c:\python25\lib\site-packages\TurboGears-1.0.3.2-py2.5.egg
> > \turbogears\controllers.py", line 359, in <lambda>
> > mapping, fragment, args, kw)))
> > File "c:\python25\lib\site-packages\TurboGears-1.0.3.2-py2.5.egg
> > \turbogears\controllers.py", line 399, in _execute_func
> > return _process_output(output, template, format, content_type,
> > mapping, fragment)
> > File "c:\python25\lib\site-packages\TurboGears-1.0.3.2-py2.5.egg
> > \turbogears\controllers.py", line 86, in _process_output
> > fragment=fragment)
> > File "C:\Python25\lib\site-packages\turbogears-1.0.3.2-py2.5.egg
> > \turbogears\view\base.py", line 129, in render
> > return engine.render(**kw)
> > File "C:\Python25\lib\site-packages\mako-0.1.10-py2.5.egg\mako\ext
> > \turbogears.py", line 48, in render
> > template = self.load_template(template)
> > File "C:\Python25\lib\site-packages\mako-0.1.10-py2.5.egg\mako\ext
> > \turbogears.py", line 44, in load_template
> > return self.lookup.get_template(templatename)
> > File "c:\python25\lib\site-packages\mako-0.1.10-py2.5.egg\mako
> > \lookup.py", line 72, in get_template
> > raise exceptions.TopLevelLookupException("Cant locate template for
> > uri '%s'" % uri)
> > TopLevelLookupException: Cant locate template for uri '/smqt/templates/
> >test.mak'
> > Powered by CherryPy 2.2.1
>
> > When I googled the error I found some posts to this mailing list dated
> > Jan 07 that described my problem, but also mentioned that the fix for
> > it had been committed, and that everything should work if I set
> > mako.directories to my template directory in my config file.
>
> > So I put mako.directories="makotest.templates" in my app.cfg, and
> > still a 500 error. I tried mako.directories="makotest/templates",
> > mako.directories="makotest\templates" all without luck.
>
> > I'm positive I'm not the only one to ever tread down this road. Does
> > anyone know what I need to do to get mako to render templates without
> > throwing 500 at me every time? Thank you.