Oxley: Pydantic classes from JSON schema

Oxley generates Pydantic classes at runtime from user-provided JSON schema documents. Heavily indebted to packages like Python-JSONschema-Objects, Oxley enables data validation pipelines to function dynamically, and with the help of Pydantic, interface directly with popular web frameworks such as FastAPI and Starlite.

Quick start

Install from PIP:

python3 -m pip install oxley

Given a simple JSONschema document:

{
  "$id": "https://github.com/jsstevenson/oxley",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "$defs": {
    "User": {
      "type": "object",
      "properties": {
        "username": {"type": "string"},
        "user_id": {"type": "number"}
      },
      "required": ["username", "user_id"]
    },
    "Post": {
      "type": "object",
      "properties": {
        "author": {"$ref": "#/$defs/User"},
        "content": {"type": "string"},
        "allow_responses": {"type": "boolean"}
      },
      "required": ["author", "content"]
    }
  }
}

Provide a schema and construct classes:

from oxley import ClassBuilder
schema_path = "path/to/my_jsonschema_document.json"
cb = ClassBuilder(schema_path)
User, Post = cb.build_classes()

The resulting objects are functioning Pydantic classes, providing features like runtime data validation and matching schema output.

dril = User(username="dril", user_id=99)
post = Post(author=dril, content="should i learn Letters first?  or choose the path of Numbers? a queston every baby must ask it self")
another_post = Post(author=dril)  # raises pydantic.ValidationError

Development

Clone and install dev and test dependencies:

git clone https://github.com/jsstevenson/oxley
cd oxley
# make virtual environment of your choosing
python3 -m pip install ".[dev,test]"

Install pre-commit hooks:

pre-commit install

Run tests with tox:

tox

MIT License

Copyright (c) 2022 James Stevenson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.