I need some help creating a virtual field with data from another virtual
field.
I have a table with start and end times. I have created a virtual field
called duration which is calculated as endtime minus starttime to give me a
duration in seconds.
This works no problem.
Now I want to create another virtual field called projectDuration which
would be the sum of all the durations for each project.
Looking over the forums I found what I think would do the job, but I can't
for the life of me, get it to work.
Here is what I found in the forum:
[quote]
If you child bizobjs have a method or *virtual* *field* that returns
their total, the easiest way to get the total of all the children
would be:
tot = sum([kid.subtotal for kid in self.__children])
[/quote]
The only difference for me is that it is the main bizobj and not a child.
Here is what I tried in my bizobj file (app/biz/Records.py)
self.VirtualFields = {"duration": self.getDuration, "projDuration":
self.getDurationProject}
def getDurationProject(self):
project = self.Record.projName
projDuration = sum([project.duration for project in self._records])
return int(projDuration)
I get the following error:
File "/home/theedo/Programs/Dabo/timeReporting/biz/Records.py", line 83, in
getDurationProject
projDuration = sum([project.duration for project in self._records])
AttributeError: 'Records' object has no attribute '_records'
Can anyone shed some light on this?
All pointer are greatly appreciated.
Thanks in Advance
Carey
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