Take a look on this project
https://github.com/Suor/django-union/
On Fri, Jun 17, 2016 at 7:16 PM, <cder...@predictivescience.com> wrote:
> I have two different queries on the same model that are in essence like
> this:
>
> queryset_1 = models.Plan.object.filter(name__startswith='a').annotate(
> group=Value('Group A', output_field=CharField()))
>
> queryset_2 =
> models.Plan.object.filter(name__startswith='b').annotate(group=Value('Group
> B', output_field=CharField()))
>
> and when I try
>
> queryset = queryset_1 | queryset_2
>
> only one of those annotations appears to exist. All rows returned have
> group set to "Group A" and when I inspect the sql it turns out that django
> only "or"-ing the filters. It send something like:
>
> SELECT plan_plan.*, "Group A" AS "group" FROM plan_plan WHERE ("plan_plan"
> ."name" LIKE 'a%s' OR "plan_plan"."name" LIKE 'b%s');
>
> Is there any way to get a true union instead of an or here? I'm not
> particularly interested in using raw sql because in the actual application
> the filters are dynamic a considerably more complicated.
>
> Thanks in advance,
>
> Cameron Derwin
>
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