Postgres: values query on json key with django

Question

I need to do a values/values_list query on nested key on a postgres backed jsonfield in django 1.10 eg.

class AbcModel(models.model):
    context = fields.JS         


        

Answer 1

It's not ideal, but I was able to get this working by adding the json field as an extra field and then calling values on that extra field:

AbcModel.objects.extra(select={
    "extra_field": "context->'lev1'->'lev2'"
}).values('extra_field').distinct()
AbcModel.objects.extra(select={
    "extra_field": "context->'lev1'->'lev2'"
}).values_list('extra_field', flat=True).distinct()