> For my usage, anyway, the "otherwise" parameter is just as relevant in
> either case. I see args and vars as parallel to passing arguments to
> Python functions by position and by keyword.
>
Understood, but because request.args are part of the URL path, it is more
likely that they will be required for a valid resource to be returned,
whereas URLs that include query strings typically return some resource even
without the query string (i.e., at the base URL).
> In either case, I might want to raise an error if a given argument is
> not present. But unlike when calling a plain Python function, web2py
> doesn't provide a builtin way to validate the arguments of a request (i.e.,
> as far as I can tell, there's no way to stipulate that a given controller
> function requires particular arguments, in the URL path or query string).
> So "otherwise" can provide a way to do what would normally be done by
> Python's enforcement of a function's call signature, but with the extra
> flexibility of potentially raising different errors for different kinds of
> mismatch.
>
If you want to validate a set of required arguments, there are probably
better ways than making separate calls to a method for each argument. I
would write a generalized function or a decorator to take some
specification and confirm that request.args and request.vars meet the
specification. Anyway, right now, instead of:
myvar = request.vars('myvar', otherwise=URL('default', 'other'))
you can simply do:
myvar = request.vars.myvar or redirect(URL('default', 'other'))
Anyway, how are you using BetterStorage? Your initial post referred
>> specifically to request.vars -- are you converting request.vars to
>> BetterStorage? In that case, it might be simpler to write a function rather
>> than a whole new class just for this purpose.
>>
>
> Not sure what you mean by "a whole new class". My BetterStorage class
> inherits from Storage, and adds nothing except the __call__ method. So I
> essentially did just write a function, but putting that function as a
> method on a class lets me inherit all the existing functionality of Storage.
>
Sure, just a matter of preference -- I tend to go for a function if a class
doesn't add any further benefit.
Anthony
--
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)
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