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You can use a double underscore in the keyword passed to filter() to access fields in a foreign key relationship. Like this:
Item.objects.filter(parent__name="xyz")
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Just for future reference for Googlers, with recent versions of Django you have to use an additional method in the keyword. For example, instead of parent__name you have to do parent__name__exact. Cato’s link contains other examples.
Source:stackexchange.com