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siena

With Siena, what is the best way to know if an entity doesn't exist in GAE?

Actually:

return all().filter("name", name).count() == 0;

May be a better way ?

Solution

  • Regarding performance I would go for something like:

    return all().filter("name", name).get() == null;

    I'm not sure about GAE but in SQL a limit 1 is several times faster than count, and obviously you don't need to know how many models have this value.