How to delete all entities of a certain kind

[Marcel Overdijk]

What is the best way in Objectify to delete all entities of a certain kind?

Something like ofy().delete().type(Car.class).all();

/M

[Grant Slender]

There is probably a better way, but this works well for me...

List<Key<Car>> keys = ofy().load().type(Car.class).keys().list();
ofy().delete().keys(keys).now();

[Jeff Schnitzer]

That's pretty much how to do it. Be careful of the eventual consistency.

If you have really large numbers of entities (more than a few thousand) you will want to take some sort of map/reduce strategy. Of just use the admin console (which uses map/reduce).

Jeff

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[Brian White]

10 years later...  This worked really well for me.  (Note that it's in Kotlin.)

val keys = ObjectifyService.ofy().load().kind<Any>(what).keys().list()

ObjectifyService.ofy().delete().keys(keys).now()

what is the saved entity "kind" (string) so it'll work even if the class that originally created the datastore no longer exists.

-- Brian