# 20120720¶

## Printing the Lino version¶

In a Tx25 it is meaningful to also print the Lino version because if a user executes a Tx25, prints it out, then dicovers and reports a “missing handler” error, I fix it, the user prints it again and zack! we two different documents of the same request. That’s not ISO 9002 compatible. Solution is to always print the Lino version and the date of printing.

New method lino.Lino.site_header().

## KeyError: u’row’¶

When an IdentifyPersonRequest has no answer because there were error messages (e.g. requests no. 2 and 5 of the demo fixture), then trying to print it causes the following traceback:

201207-17 10:00:14 WARNING ext_ui : Action "Drucken" failed for IdentifyPerson-Anfrage "IdentifyPerson-Anfrage #18":
u'row'. Ein Fehlerbericht wurde an den Systemverwalter geschickt.
201207-17 10:00:14 ERROR ext_ui : u'row'
Traceback (most recent call last):
File "/var/snapshots/lino/lino/ui/extjs3/ext_ui.py", line 1817, in api_element_view
rv = a.run(elem,ar)
File "/var/snapshots/lino/lino/mixins/printable.py", line 595, in run
bm.build(ar,self,elem)
File "/var/snapshots/lino/lino/mixins/printable.py", line 274, in build
return self.simple_build(ar,elem,tplfile,target)
File "/var/snapshots/lino/lino/mixins/printable.py", line 322, in simple_build
renderer.run()
File "/var/snapshots/appy-current/appy/pod/renderer.py", line 350, in run
self.currentParser.parse(self.contentXml)
File "/var/snapshots/appy-current/appy/shared/xml_parser.py", line 193, in parse
self.parser.parse(inputSource)
File "/usr/lib/python2.6/xml/sax/expatreader.py", line 107, in parse
File "/usr/lib/python2.6/xml/sax/xmlreader.py", line 123, in parse
self.feed(buffer)
File "/usr/lib/python2.6/xml/sax/expatreader.py", line 207, in feed
self._parser.Parse(data, isFinal)
File "/usr/lib/python2.6/xml/sax/expatreader.py", line 304, in end_element
self._cont_handler.endElement(name)
File "/var/snapshots/appy-current/appy/pod/pod_parser.py", line 279, in endElement
e.currentBuffer.action.execute()
File "/var/snapshots/appy-current/appy/pod/actions.py", line 76, in execute
self.do()
File "/var/snapshots/appy-current/appy/pod/actions.py", line 198, in do
del context[self.iter]
KeyError: u'row'


The document template has the following command:

do text for row in self.get_result_table(ar)


And get_result_table in our case is a generator function that yields no results.

The bug is in appy.pod.actions.ForAction:

class ForAction(BufferAction):
...
def do(self):
context = self.buffer.env.context
...
for item in self.exprResult:
context[self.iter] = item
...
if hasHiddenVariable:
...
else:
if self.exprResult:
del context[self.iter]


When self.exprResult is an empty iterator, the above traceback will occur. Discovered that I had already posted this bug to the appy forum. Applied my own workaround described there:

do text for row in list/self.get_result_table(ar))


Posted my suggestion for a solution.

## Miscellaneous¶

Acting as another user will not give you the access permissions of that user. A secretary who has authority to act as her boss in order to manage his calendar should not also see e.g. statistic reports to which she has no access. New exception to this rule: For system admins it is different: when a system admin acts as another user, he inherits this user’s access permissions. System admins use this feature to test the permissions of other users.