Contexts 3.7.1

Pre-processing and Post-processing Methods¶

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Data pre-processing and post-processing methods can be registered using the pre_load, post_load, pre_dump, and post_dump decorators.

Passing “many”¶

By default, pre- and post-processing methods receive one object/datum at a time, transparently handling the many parameter passed to the Schema’s dump()/load() method at runtime.

In cases where your pre- and post-processing methods needs to handle the input collection when processing multiple objects, add pass_many=True to the method decorators.

Your method will then receive the input data (which may be a single datum or a collection, depending on the dump/load call).

Example: Enveloping¶

One common use case is to wrap data in a namespace upon serialization and unwrap the data during deserialization.

Raising Errors in Pre-/Post-processor Methods¶

Pre- and post-processing methods may raise a ValidationError. By default, errors will be stored on the '_schema' key in the errors dictionary.

If you want to store and error on a different key, pass the key name as the second argument to ValidationError.

Pre-/Post-processor Invocation Order¶

In summary, the processing pipeline for deserialization is as follows:

  1. @pre_load(pass_many=True) methods

  2. @pre_load(pass_many=False) methods

  3. load(in_data,many) (validation and deserialization)

  4. @post_load(pass_many=True) methods

  5. @post_load(pass_many=False) methods

The pipeline for serialization is similar, except that the pass_many=True processors are invoked after the pass_many=False processors.

  1. @pre_dump(pass_many=False) methods

  2. @pre_dump(pass_many=True) methods

  3. dump(obj,many) (serialization)

  4. @post_dump(pass_many=False) methods

  5. @post_dump(pass_many=True) methods

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You may register multiple processor methods on a Schema. Keep in mind, however, that the invocation order of decorated methods of the same type is not guaranteed. If you need to guarantee order of processing steps, you should put them in the same method.

Contexts 3.7.1 For Pc

Last Updated on August 3, 2020 by

Contexts 3.7.1
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