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alfred westerveld's Library tagged engine →  View Popular

22 Oct 09

Google App Engine Blog: 10 things you (probably) didn't know about App Engine 

  • for entity in MyModel.all().filter("color =",
        old_favorite).fetch(100):
      entity.color = new_favorite
      entity.put()

    Doing the update this way requires one datastore round trip for the query, plus one additional round trip for each updated entity - for a total of up to 101 round trips! In comparison, take a look at this example:

    updated = []
    for entity in MyModel.all().filter("color =",
        old_favorite).fetch(100):
      entity.color = new_favorite
      updated.append(entity)
    db.put(updated)

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