Python 3 library for easily JSON encoding/decoding complex class-based Python models, using an arbitrarily complex (but easy to write!) mapping schema.
Project description
HGI JSON
A Python 3 library for easily JSON encoding/decoding complex class-based Python models, using an arbitrarily complex (but easy to write!) mapping schema.
Features
Ability to create serializers and deserializers for complex class-based models using a mapping schema defined in Python.
Works seamlessly with Python’s in-built json.dumps and json.loads serialization methods - does not require the use of exotic convert_to_json/convert_from_json methods.
Python models are not be coupled to the serialization process - models do not have to inherit from a particular superclass or implement an interface with a to_json (or similar) method.
JSON representations produced are not coupled to the Python model - an arbitrary mapping between the JSON and the model can be defined.
Simple to define serialization of subclasses, based on how superclasses are serialized.
Pure Python 3 - no DSL, XML or similar required to describe mappings, not using outdated Python 2.
Overview
Basic Steps
Define schema for mapping an object to and/or from JSON representation using a list of JsonPropertyMapping definitions.
Use MappingJSONEncoderClassBuilder with the mappings to build a subclass of JSONEncode for serializing instances of a specific type. Similar with decode.
Use created encoder class with Python’s in-built json.dumps via the cls parameter. Similar with decoder.
Defining Encoders/Decoders
Encoders and decoders are generated based on a defined JSON <-> Model mapping. A mapping can be written that allows complex classes, such as that below, to be mapped to and from any JSON representation:
class CustomClass(SupportFor, MultipleInheritance):
self __init__(self, support_for_constructor_parameters):
self.support_for_all_types_of_properties = ""
self.including_sets = set()
self.and_lists = list()
self.and_dictionaries = dict()
self.and_complex_properties = ComplexClass()
self.and_nested_objects_of_the_same_type = CustomClass()
self.and_properties_not_in_json_if_none = None
self support_for_setters(self, value):
"""..."""
self support_for_getters(self):
"""..."""
CustomClassJSONEncoder = MappingJSONEncoderClassBuilder(...).build() # type: JSONEncoder
CustomClassJSONDecoder = MappingJSONDecoderClassBuilder(...).build() # type: JSONDecoder
custom_class_as_json = json.dumps(custom_class, cls=CustomClassJSONEncoder) # type: str
custom_class = json.loads("<custom_class_as_json>", cls=CustomClassJSONDecoder) # type: CustomClass
Documentation
For more details, including information on how to setup and use the library, please view the documentation on ReadTheDocs or read it from /docs.
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