The emitter should support chained querysets

jonozzz avatarjonozzz created an issue

The fix is pretty simple assuming that the user chained a queryset:

in piston/ instead of:

if isinstance(thing, QuerySet):


import itertools
if isinstance(thing, (QuerySet, itertools.chain)):

Chained QuerySets are useful when you need to join two or more QS and you don't have to use UNION in raw SQL.

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