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src/jane/quakeml/plugins.py
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you can filter also right here by appending your filter after get_filtered_queryset(), as this should return a QuerySet object itself - as long the queryset is not evaluated by looping over it you can continue to modify it like filtering, ordering etc.
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Yeah, I saw that, but I couldn't figure out how to invert the queryset at the end, so the only way I saw was to combine all these queries and invert them inside the SQL extra(where=..) query.
i.e. make the filter not return events that match all given criteria, but rather return events, that do not match the combination of given criteria. otherwise it is impossible to define a retrieve permission for a combination of two criteria (i.e. when user "does not have permission" to exclude events that match the given combination of criteria, e.g. exclude events at site X and below magnitude Y)
note that this needs krischer/django-plugins#11 to work
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..in order to filter out small events at certain sites. Based on #21. No need to merge in a hurry, pushing this mostly for visibility, as the motivating use case for #21.