I have two models: Activity and Place. The Activity model has a ReferenceProperty to the Place model.
This was working fine until the Place table started growing and now when trying to edit an Activity via django admin I get a memory error from Google (it doesn't happen if I remove that field from the Activity admin's fieldsets)
The widget used to edit the RefrenceProperty uses Place.all() to get the possible values. As both Activity and Place are sharded by a city property I would like to optimize the widget's choice query from Place.all() to just the relevant places, for example Place.all().filter("city =", )
I couldn't find a way to override the query in the docs and I was wondering if the above is even possible? and if so, how?