I'm looking for the best way to query based on the existence of an instance of a subclass. In my case, there are Actions that have several subclasses, like FriendRequest, PhotosTagged, etc. The user has selected a set of types they are interested in, so I need to query for all the actions that are instances of one of these particular subclasses. I could query for all, and then filter on the python-side, but that is what I'm looking to avoid. Is there a way to do this from the query api. If there isn't, what would one look like and would it be accepted?
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