On Wednesday, August 25, 2021 at 3:39:34 PM UTC-7 Rob Paire wrote:
> Hi Web2py
> I hope someone can explains this puzzling behavior. The code below was
> taken from the book, and it works as given, but when I remove the
> "yes_or_no" condition from the field list parameters it causes
> a KeyError('id') error, and I don't understand why.
>
>
> * condition = db.person.name.startswith('B')*
> * yes_or_no = condition.case('Yes', 'No')*
> * rows = db(db.person.name <http://db.person.name> ==
> 'Bob').select(db.person.name <http://db.person.name>,yes_or_no
> ).as_dict() *
> * rows = db(db.person.name <http://db.person.name> ==
> 'Bob').select(db.person.ALL).as_dict() *
> * ## the two select examples above works as expected*
>
> * rows = db(db.person.name <http://db.person.name> ==
> 'Bob').select(db.person.name <http://db.person.name>).as_dict() *
> This last example in red throws a KeyError('id') error when trying to name
> specific fields, but works fine when returning ALL fields, or when a
> condition is specified.
>
I don't have a complete answer, but it's the as_dict() that throws the
error, because it's looking for a key that isn't there. If you do
for row in rows:
print row
you see that row doesn't have "id" as a key; it only has 'name' as a key.
as_dict() and as_list() must have a requirement for an id field, and if you
make your select
rows = db(db.person.name == 'Bob').select(db.person.name
,db.person,id).as_dict()
it should work as expected.
[The requirement isn't mentioned in the book]
/dps
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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