[web2py] issue with conditional columns in select with web2py dal query

[Richard]

Hello,

I think I just hit a limitation with web2py dal select query build with conditions...

Here the issue:

if someflag:

    columns = [(db[table].date - db.other_table.received_timestamp.date()).avg().with_alias('avg_date')]  # This one does work

    # Failed on : 'Field' object has no attribute 'date'

    columns = [lambda: (db[table].date - db.other_table.received_timestamp.date()).avg().with_alias('avg_date')]  # This one does work neither

    # Failed on : 'function' object has no attribute 'type'

else:

    columns = [(db[table].date - db.other_table.date.date()).avg().with_alias('avg_date')]  # This one works

db(...).select(*columns)

Is there a way to make aggregate lazy somehow?

Thanks a lot

Richard

[Richard Vézina]

Workaround it like that :

if someflag:

    try:

        base_date = db.other_table.received_timestamp.date()

    except:

        base_date = db.other_table.date

    columns = [(db[table].date - base_date).avg().with_alias('avg_date')]  # Works YEAH!

else:

    columns = [(db[table].date - db.other_table.date.date()).avg().with_alias('avg_date')] 

Richard

--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
---
You received this message because you are subscribed to the Google Groups "web2py-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to web2py+un...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.