On Wed, 2007-05-30 at 23:40 +0200, Bram - Smartelectronix wrote:
> Hey everyone,
>
>
> I was thinking that I'd like to know if there is a standard way of
> transforming a newforms reply to JSON (or anything else).
>
> I'd like to think it would be easy to have a new-form, submit it via
> JSON and be able to -automatically- display the errors, as if you would
> just have called " {{form}} ".
>
> Of course one could return str(form) in the response, but in my case
> it's not HTTP but rather flash that needs to interpret the results (the
> errors etc) so I need some JSON love.
>
> Of course I can roll my own and it's not too hard in this case, but! Why
> reinvent the wheel :-)
The intended solution (by the newforms design) to requirements like this
is that you just write a new output method in your Form subclass. You
are essentially replacing _as_html(). The logic in that method for how
to pull together the various pieces of information you need should be
fairly clear from reading the code. Actually, _as_html() looks a bit
more complex that it is for most uses, because it is intended to handle
a variety of formatted output and options like errors on their own or
inline. So the lines of code that pull out the information are not very
many.
I think it would better to override _as_html() -- or write a method with
a new name that does the same thing -- in your subclass, rather than
trying to mess around passing the right format string to _as_htm. You
already have a good tool (the simplejson) for converting data structures
to JSON, so concentrate on constructing the right data structure, rather
than worrying about having to debug the object -> string conversion
process.
Regards,
Malcolm
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