问题
I would like to update a property of an entity that has a lot of properties.
If I understand it correctly, whenever I retrieve the entity from the datastore by
entity = key_of_entity.get()
to later update it's property
entity.some_property += 1
entity.put()
I am charged for read of every property of that entity? Since this entity has quite a few properties, such reading over and over again can be quite expensive. Is there any way to update an entity's property without having to do a read on it first?
回答1:
The only solution is to split this entity into two parts: rarely updated and frequently updated. You can make them totally independent (with an id of one entity as a property in another entity), or you can make one of them a parent and the other one a child.
来源：https://stackoverflow.com/questions/22103245/updating-an-entitys-property-without-retrieving-the-entity-from-the-ndb