collective.data.examples custom field wont save data - plone

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This is a continuation from this question.
I have used collective.examples.userdata
and successfully added a 'Position' text field to my User registration form. My problem is that when I go to my /##personal-information page, fill in the field and hit 'Save', it just shows the field again and it is blank. I don't appear to be able to save any information to this field. I have tried running my instance in foreground mode but I can't see anything outputted to it when trying to save new information.
I don't know if this'll help but when I try to make use of the following TALES statement:
tal:define="membership context/portal_membership;
info python:membership.getMemberInfo(user.getId());"
and then:
tal:replace="info/position"
I get the following traceback:
Traceback (innermost last):
Module ZPublisher.Publish, line 126, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 46, in call_object
Module Shared.DC.Scripts.Bindings, line 322, in __call__
Module Shared.DC.Scripts.Bindings, line 359, in _bindAndExec
Module Products.PageTemplates.ZopePageTemplate, line 334, in _exec
Module Products.PageTemplates.ZopePageTemplate, line 431, in pt_render
Module Products.PageTemplates.PageTemplate, line 79, in pt_render
Module zope.pagetemplate.pagetemplate, line 113, in pt_render
Module zope.tal.talinterpreter, line 271, in __call__
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 888, in do_useMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 954, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 858, in do_defineMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 954, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 954, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 946, in do_defineSlot
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 858, in do_defineMacro
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 533, in do_optTag_tal
Module zope.tal.talinterpreter, line 518, in do_optTag
Module zope.tal.talinterpreter, line 513, in no_tag
Module zope.tal.talinterpreter, line 343, in interpret
Module zope.tal.talinterpreter, line 620, in do_insertText_tal
Module Products.PageTemplates.Expressions, line 225, in evaluateText
Module zope.tales.tales, line 696, in evaluate
- URL: /mysite/portal_skins/custom/home_page_view
- Line 32, Column 11
- Expression: <PathExpr standard:u'info/position'>
- Names:
{'container': <PloneSite at /mysite>,
'context': <ATDocument at /mysite/front-page>,
'default': <object object at 0x7f1c681eeb30>,
'here': <ATDocument at /mysite/front-page>,
'loop': {},
'nothing': None,
'options': {'args': ()},
'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x9540260>,
'request': <HTTPRequest, URL=http://dan-apache:8080/mysite/front-page/home_page_view>,
'root': <Application at >,
'template': <ZopePageTemplate at /mysite/home_page_view used for /mysite/front-page>,
'traverse_subpath': [],
'user': <PropertiedUser 'dan'>}
Module zope.tales.expressions, line 217, in __call__
Module Products.PageTemplates.Expressions, line 147, in _eval
Module zope.tales.expressions, line 124, in _eval
Module Products.PageTemplates.Expressions, line 77, in boboAwareZopeTraverse
Module zope.traversing.adapters, line 136, in traversePathElement
- __traceback_info__: ({'language': '', 'description': '', 'username': 'dan', 'has_email': False, 'location': '', 'fullname': '', 'home_page': ''}, 'position')
Module zope.traversing.adapters, line 50, in traverse
- __traceback_info__: ({'language': '', 'description': '', 'username': 'dan', 'has_email': False, 'location': '', 'fullname': '', 'home_page': ''}, 'position', [])
LocationError: ({'language': '', 'description': '', 'username': 'dan', 'has_email': False, 'location': '', 'fullname': '', 'home_page': ''}, 'position')
Any thoughts would be greatly appreciated!

Answer 1

Okay FYI anyone else experiencing this, I went into the ZMI, went into portal_memberdata and then added some text to the Position field that had been created by my add-on.. Upon clicking save I could see the information in the /##personal-information form, I am now able to update it on a per-user basis.