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A descriptor for a Configuration option.
Inherits From: expected_type
google.appengine.datastore.datastore_rpc.ConfigOption(
validator
)
This class is used to create a configuration option on a class that inherits from BaseConfiguration. A validator function decorated with this class will be converted to a read-only descriptor and BaseConfiguration will implement constructor and merging logic for that configuration option. A validator function takes a single non-None value to validate and either throws an exception or returns that value (or an equivalent value). A validator is called once at construction time, but only if a non-None value for the configuration option is specified the constructor's keyword arguments.
Methods
__call__
__call__(
*args
)
Gets the first non-None value for this option from the given args.
| Args | |
|---|---|
*arg
|
Any number of configuration objects or None values. |
| Returns | |
|---|---|
| The first value for this ConfigOption found in the given configuration |
objects or None.
| Raises | |
|---|---|
| datastore_errors.BadArgumentError if a given in object is not a |
configuration object.