Google App Engine retrieve user defined key name

Is there a way to retrieve the key name you set using:

Model(
  key_name = ...
  ...
)

I tried using the key() method but开发者_开发问答 that returns the one Google makes.

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It is key().name()

Docs on the Key class

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I was searching for the solution in my case of NDB datastore. check NDB Key link.

With NDB model, you have to use model.key.string_id()