Workaround for empty helpers in Turbogears 2.1

Last release of TG2.1 has a subtle bug due to the changes helpers management to support in pylons 1.0, this makes the “h” object appear as an empty dict instead of your application helpers module.

The bug is already tracked on http://trac.turbogears.org/ticket/2488 and as the fix is quite easy it will be probably fixed soon. In the mean time you can work around it by monkey patching the pylons.templating.pylons_globals (I do it in lib/app_globals.py but any place is fine).

import tg.render, pylons
def patched_pylons_globals():
    x = tg.render.my_pylons_globals()
    if x['h'] == {}:
        conf = pylons.config._current_obj()
        x['h'] = conf['package'].lib.helpers
    return x
pylons.templating.pylons_globals = patched_pylons_globals

This will make your helpers work again in TG2.1.
Please pay attention that this code is specific for TG2.1, TG2.0 didn’t perform pylons_globals monkey patching and so the code won’t work.

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