I've been working for a while on a very flexible (and so increasingly
complex) multiple-select widget that can be re-populated from the db via
ajax (without submitting the form). One think I had to do was figure out
how to get the name of the table referenced by the field using my widget.
With some help from the folks here I found this solution:
referencetable = myfield.requires[0].ktable
I'm starting to realize, though, that this is fragile. I know it's doing an
end-run around the DAL api (accessing implementation details instead of the
stable api). I also found recently that this was broken by the IS_EMPTY_OR
validator. For the moment I'm hacking a solution by doing this:
try:
referencetable = myfield.requires[0].ktable
except AttributeError:
# because IS_EMPTY_OR doesn't have a property .ktable,
# it's on the second, wrapped validator
referencetable = myfield.requires[0].other.ktable
But I'm digging myself a deeper hole. Now I'm using a second implementation
detail (the "other" instance variable of IS_EMPTY_OR) and my widget is that
much more prone to being broken by future releases.
So I'm wondering whether
(a) there's a way to access this data via the api that I'm just missing; or
(b) this is reason to add access to the referenced table to the api.
This could be as simple as adding a get_reference_table() method to the
validators that (for the time being) draws on the instance variables I've
been using.
# in IS_EMPTY_OR
def get_reference_table(self):
return self.other.ktable
# in IS_IN_DB
def get_reference_table(self):
return self.ktable
I'm not sure, though, whether the validator is the best place for that
method. Should it be a method of Field instead? (That is, if others see a
need for this at all.)
Cheers,
Ian
--
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 [email protected].
For more options, visit https://groups.google.com/groups/opt_out.
