Well, I'm not sure there's a nice general solution to this one. Since
"show_if" is kind of an add-on to Field and isn't really a part of
Expression or Validator or anything else. Here's what I came up with...
First I created my set of "show_if" fields and set their validators to the
existing ones with a new "OR" validator added:
expr = IS_EXPR('use_qual_times==True',environment=current.request.vars)
for ea in ['qual_course','standard1','standard2','standard3']:
field = table[ea]
field.show_if = (table.use_qual_times==True)
requires = field.requires
if requires:
field.requires = OR(expr, requires)
Then I created a validator "OR" that takes a "first" and "second" argument.
If "first" passes then "second" is never evaluated. I also allowed for
"second" being a list of validators. But not "first", since I'm lazy and I
knew it would only be the IS_EXPR validator I was adding:
from gluon.validators import Validator
class OR(Validator):
def __init__(self, first, second):
self.first, self.second = first, second
if not isinstance(second, (list,tuple)):
self.second = [second]
def __call__(self, value):
retval, reterr = self.first(value)
if reterr is not None:
for ea in self.second:
retval,reterr = ea(value)
if reterr is not None:
break
return (retval, reterr)
Not as general case as I'd like. Mostly because I see no graceful way to
automatically generate the IS_EXPR() from the argument supplied to show_if.
If that could be automated, then this processing could be pushed into the
FORM or SQLFORM mechanics. (But it's getting a little crowded in there,
I'll admit!)
-- Joe
On Monday, April 10, 2017 at 11:23:37 AM UTC-7, Anthony wrote:
>
> This might be as simple as emptying out the "requires" attribute if the
>> "show_if" causes the field to be visible. But I don't change core code --
>> I don't want the hassle of departing from the stock distro of web2py.
>>
>
> You could change the core code and submit a pull request. ;-)
>
>
>
>
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