I'm going to say it outright I don't think this should be supported.
I don't think this should be considered a backwards compatibility problem,
because you're not using the DAL API you're just sending SQL in a string.
If you put that "GROUP_CONCAT" in a pyDAL Expression and that doesn't work
then I would agree it's a problem. Try this:
from pydal.objects import Expression
dialect = db._adapter.dialect
def group_concat(first, second, query_env={}):
return "GROUP_CONCAT(%s, '%s')" % (dialect.expand(first, query_env),
second)
rischi_della_mansione = Expression(db, group_concat, db.RISCHI.id, ', ',
'string')
We need to define that the proper way to put custom SQL mixed with DAL code
is using Expression and document how to use it. SQL in strings isn't
acceptable, for that you use executesql.
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