On May 6, 5:26 am, NicoEchániz <lwcy...@gmail.com> wrote:
> Hello,
>
> I have a model which has a ForeignKey to itself. I'm doing this to
> represent a hierarchy which I then need to display in the
> corresponding select field of my form.
>
> I've come up with a simple custom Form which represents my select
> choices like this:
> ---------
> level0.a
> level0.a > level1.a
> level0.a > level1.b
> level0.b
>
> etc.
>
> You can find the corresponding code snippet here:http://dpaste.com/hold/41342/
>
> It's all working well but I seem to have some sort of cache or class
> lifespan problem... the thing is that whenever I add a new item it
> does not get displayed in the select choices next time I visit the
> form. I need to reload the page a bunch of times for it to show up.
>
> So, what do I need to do to avoid this behaviour?
>
> Thank you all very much in advance,
> NicoEchániz
Your code in lines 22 onwards is being executed when the form class is
defined. So the choices for robro_superior are being set at that
point, and not updated.
To fix this, put this code into an __init__() method. This is called
when the form is *instantiated* - so each time, it will get the list
fresh from the database.
class RubroForm(ModelForm):
rubro_superior = ModelChoiceField(queryset=Rubro.objects.all(),
required=False)
def __init__(self, *args, **kwargs)
super(RubroForm, self).__init__(*args, **kwargs)
r = Rubro.objects.all()
choices = [('', '- - - -')] + [(rubro.id, rubro.jerarquia) for
rubro in r]
choices.sort(key=itemgetter(1))
rubro_superior.choices = choices
--
DR.
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