Woo , finally did it !
For those coming after me , here is how I did :
Your
struggle probably comes from the self.value() never being a list , right ?
Well then, if you override the template filter.html to add a "multiple" to
the <select>, then , in your redefinition of the queryset() function, do a
self.value = request.GET.getlist("[Insert parameter_name from your
filter]"), then you'll get the list you clicked back in the Django admin !
(The problem being that django uses request.GET.items() to retrieve the
self.value(). Alas, as stated in this documentation,
<https://docs.djangoproject.com/fr/1.9/ref/request-response/#django.http.QueryDict>
this method only gets the last item of the QueryDict object, unlike
getlist() !
There is still one little problem to fix, being that , when loading the new
page, the filter is being "resetted", containing only the last item of the
QueryDict. I believe that's nothing that an handy JS /JQuery script can't
handle though, so I may edit this comment adding the script when I manage
to get it to work.
Cheers!
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