google app engine - NDB -- How to know if an entity has been contained under a root Key -


i want add player's data ndb. before add them, have check whether data exists in datastore or not. can't find obvious answer in official docs. can give me simple code , explanation problem? here part of code.

self.player = player(parent=ndb.key("players", "playerskeys"), name = self.request.get("name"), playerid = self.request.get("id")) self.player.put()

update-------------------

by using query, if contains data, qry.get() not none.

here solution:

qry = player.query(player.userid == self.request.get("id")) if qry.get() == none:     # put data datastore     self.player = player(parent=ndb.key("players", "playerskeys"), name = self.request.get("name"), userid = playerid)     self.player.put() else:      # nothing

the answer player.get_or_insert

player_key = player.query(player.userid == self.request.get("id")).get(keys_only=true) player = player.get_or_insert(player_key, **data)

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