Django queryset to match all related objects

Question

Let\'s say I have a ForeignKey from Coconut to Swallow (ie, a swallow has carried many coconuts, but each coconut has been carried by only one swallow). Now let\'s say that

Answer 1

See the docs on queries spanning multi-valued relationships -- you should chain filter calls.

A simple way to go would be something like

queryset = Swallow.objects.all()
for coconut in coconuts:
    queryset = queryset.filter(coconuts_carried=coconut)

A fancy way to do this in one line using reduce would be

reduce(lambda q, c: q.filter(coconuts_carried=c), coconuts, Swallow.objects.all())