Maybe something like this:
def allows_none(field):
from pydal._globals import DEFAULT
requires = field.requires if field.requires and field.requires !=
DEFAULT else []
requires = requires if isinstance(requires, list) else [requires]
return not any(validator(None)[1] != None for validator in requires)
Then simply check via:
allows_none(db.mytable.myfield)
Note, the above only checks validators -- if you also want to check for the
"notnull" or "required" attributes, you can add those checks to the
function. It also only checks for the specific value None -- you could
extend it to check for empty strings (and possibly empty lists in the case
of list:-type fields) as well.
Anthony
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