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Classes

KeyProperty

Property that stores a key without automatically dereferencing it.

Note that the default alternative, db.ReferenceProperty, performs a datastore RPC when it is accessed, which can lead to hidden performance problems.

Furthermore, it needs to have the Kind specified when it is declared, which creates a code dependency between models that can be undesirable.

KeyProperty helps alleviate these concerns.

validate

Validate value is a key or model.

Args:
  value: The value to validate.
Returns:
  google.appengine.ext.db.Key
Raises:
  TypeError if the value can't be converted into a `db.Key`