def query_mongo(username, id_string, query=None, hide_deleted=True):
query = json.loads(query, object_hook=json_util.object_hook)\
if query else {}
query = dict_for_mongo(query)
query[USERFORM_ID] = u'{0}_{1}'.format(username, id_string)
if hide_deleted:
# display only active elements
# join existing query with deleted_at_query on an $and
query = {"$and": [query, {"_deleted_at": None}]}
return xform_instances.find(query)
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