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copied!<blockquote> <p>My question is more from curiosity - is there any way to use _set in the template, and still filter down or narrow the set?</p> </blockquote> <p>Not by default, since there's no way to pass arguments to the filter call.</p> <ul> <li>If it's functionality that needs to be repeated <strong>variably</strong>, often, and related to the template: build a custom template tag or filter (which can accept arguments).</li> <li>If it's functionality that's specific to a view, code it in the view.</li> <li>If it's functionality that's the same across multiple views, build the function in a dry place. </li> </ul> <p>For #3, there are so many factors that determine where this code should go that there's no general solution. You could import a function into your views? Use a model manager? A model instance method? context processor? etc. </p> <blockquote> <p>Could you write a custom Model Manager to do this, so that _set will only ever return objects for the current year? Or is there some other way?</p> </blockquote> <p>It looks like you can actually just by using a model manager for your reverse related model.</p> <pre><code>class RoomManager(models.Manager): def current_year(self): return self.get_queryset().filter(year=datetime.date.today().year) for room in site.room_set.current_year(): ... </code></pre> <p>Or just on the parent model:</p> <pre><code>class Site(models.Model): ... def year_room_set(self): return self.room_set.filter(year=datetime.date.today().year) </code></pre>

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