Working as much as I have on widgets (use of, not creation of) I've come up
with a few useful tidbits I'd like to share:
I define a SingleSelectField as:
> W.SingleSelectField('author', label='Author',
> options=make_list(model.Account, 'No Author'),
> help_text='Select an author to display in byline information.'),
The make_list function and build_list method are the trick, here. The
make_list function prepends an optional empty value to an existing callable
(which should return a list of tuples). It also allows you to pass arguments
to the callable; the primary reason for the function.
> def make_list(c, none_label=None, *args, **kwargs):
> def _call():
> return [ [], [(None, none_label)] ][none_label is not None] + \
> c.build_list(*args, **kwargs)
> return _call
The build_list method of my SQLObject classes return a list of tuples suitable
for use in a select-type widget (single, multiple, radio, or checkbox) by
performing a simple .select() on itself, passing any arguments it receives to
the select method.
> @classmethod # of Account
> def build_list(self, *args, **kwargs):
> return [(a.id, a.full_name) for a in self.select(*args, **kwargs)]
An alternative and generic build_list function is: (and can be used alongside
classes using the above method)
> @classmethod # of anything
> def build_list(self, field, *args, **kwargs):
> return [(a.id, getattr(a, field)) for a in self.select(*args, **kwargs)]
Any additional arguments to make_list are automatically passed, thus, to the
select method, allowing you to use SQLBuilder in your arguments to the
widget. Take the following examples:
> from model import *
> from datetime import datetime
>
> ..., options=make_list(Account, None,
> Account.q.enabled, orderBy=Account.q.full_name), ...
>
> ..., options=make_list(Language, "Unspecified", Language.q.strings > 0), ...
>
> # Alternate method for accounts:
> ..., options=make_list(Account, None, 'user_name'), ...
Note that you can't use both methods within a single class.
Enjoy!
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