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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T06:18:30+00:00 2026-05-25T06:18:30+00:00

I have two Model’s which are related with a ForeignKey field. Let’s call these

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I have two Model’s which are related with a ForeignKey field.
Let’s call these objects Event and EventRegistration.

I can easily, for example, do this:

EventRegistration.objects.filter(event=Event.objects.get(name="Some Event"))

But, I cannot do something like this:

EventRegistration.objects.filter(event=Event.objects.all())

I know this is a contrived example, but is there a way to filter against whole QuerySets in a similar way to the second line of code?

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  1. Editorial Team
    Editorial Team
    2026-05-25T06:18:30+00:00Added an answer on May 25, 2026 at 6:18 am
    EventRegistration.objects.filter(event__in=Event.objects.all())
    
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