Am Dienstag, 11. Oktober 2016 14:16:50 UTC+2 schrieb Aymeric Augustin:
>
> Hello Sven,
>
> On 11 Oct 2016, at 14:07, Sven R. Kunze <srk...@gmail.com <javascript:>>
> wrote:
>
> I took a sample of 4 of my colleagues and asked them what the problem with
> expressions like {% if form.is_valid %} is. They have no idea. They said
> "it might not make sense in some cases but when it makes sense, it doesn't
> look very terrible me”.
>
>
> Can you show a non-contrived example, predating this discussion, of a
> situation where this pattern make sense?
>
For displaying some error indicators, changing backgrounds to signal colors
(like red), etc. I don't know what counts as a non-contrived example to you.
>
> So, what's the real problem here?
>
>
> The real problem is that templates aren’t the correct place to implement
> business logic such as form validation.
>
I did never say "let's do business logic in templates". AFAIK, *displaying*
errors (or preparing for it HTML-structure-wise) requires *knowing* whether
a form is invalid or not.
When there's some logic to do, that's fine. But when some developer
requires a simple boolean flag to know whether a form is valid or not, why
shouldn't he use form.is_valid? That looks to me like making things more
complicated than necessary.
Also, think about GET forms + AJAX which do not POST after redirect at all
(e.g. search form + result table in separate AJAX containers). There you
will re-use the same template for success and failure.
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