Re: TypeError @ render_mako

[Ben Bangert]

On Mar 31, 2009, at 9:17 AM, Max Ischenko wrote:

I have migrated my codebase to 0.9.7 and when I'm trying to use render_mako instead of render() I get a strange error:

 return render('/pages/%s.html' % name)

 cache_type=cache_type, cache_expire=cache_expire)

 return render_func()

 return literal(template.render_unicode(**globs))

 return context._pop_buffer().getvalue()

 return self.delim.join(self.data)

File '/Users/amaslov/Projects/dou-pylons/doupy/doupy/controllers/ root.py', line 239 in staticpage File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Pylons-0.9.7-py2.5.egg/pylons/templating.py', line 274 in render_mako File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Pylons-0.9.7-py2.5.egg/pylons/templating.py', line 249 in cached_template File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Pylons-0.9.7-py2.5.egg/pylons/templating.py', line 271 in render_template File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Mako-0.2.4-py2.5.egg/mako/template.py', line 138 in render_unicode return runtime._render(self, self.callable_, args, data, as_unicode=True) File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Mako-0.2.4-py2.5.egg/mako/runtime.py', line 348 in _render File '/Users/amaslov/Projects/dou-pylons/py/lib/python2.5/site- packages/Mako-0.2.4-py2.5.egg/mako/util.py', line 74 in getvalue TypeError: sequence item 68: expected string or Unicode, NoneType found

Cheers,
Ben

Generally this is caused when you have a component (mako def) that is echoing some value out. I think its because the default escaper that is now used with Mako will *not* turn a None into a '' during escaping. Check to see that you don't have anything in a ${} somewhere that might evaluate to a None as that will cause it. I'm looking at fixing the default escaper so that None's become a '' instead and don't cause this Mako bug, though its possible some people will want to know when something in a ${} that *should* return something is instead returning None.

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