Re: Complex validation

On 5/12/2013 3:04pm, Lachlan Musicman wrote:
> Hola,
>
> I have an object Part that has a method part_number()
>
> part_number is a function that returns an identifying string based on
> a number of different vars on the model.
>
> part_number needs to be unique, but the building of the part_number is
> complex enough that it cannot just be done via class Meta:
> unique_together
>
> The model's clean():
>
> pn = self.part_number()
> all_parts = Part.objects.all()
> for part in all_pns:
> if pn == part.part_number():
> raise ValidationError('Part numbers must be unique.
> Part number %s already exists.' % part.part_number())

What happens if clean() is called for an existing Part?

>
>
> It's fairly straight forward.
>
> Ideally I would like to make the %s in the error message to an <a>
> link for reference value.

IMHO, "ideally" is a deadly whirlpool which sucks your life away without
measurable gain. I reckon you should aim for the most basic/simple/easy
mechanism. Then later on, if users can actually make a decent case for
extra information via a hyperlink you could add the extra feature.

Good luck

Mike

>
> Is it possible to use/pass context data like that in a ValidationError message?
>
> eg:
>
> raise ValidationError(mark_safe('Part numbers must be unique. Part
> number %s <a href="parts/{{ part.slug }}'>already exists</a>.' %
> part.part_number()))
>
>
> cheers
> L.
>
>

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