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Maps an OpenAPI schema to SQLAlchemy models.

Project description

OpenAlchemy

Translates an OpenAPI schema to SQLAlchemy models.

Installation

python -m pip install OpenAlchemy
# To be able to load yaml file
python -m pip install PyYAML

Example

For example, given the following OpenAPI specification:

# ./examples/simple-example-spec.yml
openapi: "3.0.0"

info:
  title: Test Schema
  description: API to illustrate OpenAlchemy MVP.
  version: "0.1"

paths:
  /employee:
    get:
      summary: Used to retrieve all employees.
      responses:
        200:
          description: Return all employees from the database.
          content:
            application/json:
              schema:
                type: array
                items:
                  "$ref": "#/components/schemas/Employee"

components:
  schemas:
    Employee:
      description: Person that works for a company.
      type: object
      x-tablename: employee
      properties:
        id:
          type: integer
          description: Unique identifier for the employee.
          example: 0
          x-primary-key: true
          x-autoincrement: true
        name:
          type: string
          description: The name of the employee.
          example: David Andersson
          x-index: true
        division:
          type: string
          description: The part of the company the employee works in.
          example: Engineering
          x-index: true
        salary:
          type: number
          description: The amount of money the employee is paid.
          example: 1000000.00
      required:
        - id
        - name
        - division

The SQLALchemy models file then becomes:

# models.py
from open_alchemy import init_yaml

init_yaml("./examples/simple-example-spec.yml")

The Base and Employee objects can be accessed:

from open_alchemy.models import Base
from open_alchemy.models import Employee

An extensive set of examples with a range of features is here:

examples for main features

An example API has been defined using connexion and Flask here:

example connexion app

Documentation

Read the Docs

Features

Supported

The following features are supported:

  • initializing from JSON,
  • initializing from YAML,
  • integer (32 and 64 bit),
  • number (float only),
  • boolean,
  • string,
  • $ref references for columns and models,
  • primary keys,
  • auto incrementing,
  • indexes,
  • composite indexes,
  • unique constraints,
  • composite unique constraints,
  • column nullability,
  • foreign keys,
  • many to one relationships,
  • one to one relationships,
  • one to many relationships,
  • custom foreign keys for relationships,
  • back references for relationships,
  • allOf inheritance for columns and models,
  • from_dict model methods to construct from dictionaries,
  • to_dict model methods to convert instances to dictionaries and
  • exposing created models under open_alchemy.models removing the need for models.py files.

Not Supported

The following features are on the backlog:

  • many to many relationships.

Contributing

Fork and checkout the repository. To install:

python -m venv venv
source ./venv/bin/activate
python -m pip install -e .[dev,test]

To run tests:

tox

Make your changes and raise a pull request.

Compiling Docs

python -m venv venv
cd docs
make html

This creates the index.html file in docs/build/html/index.html.

Release Commands

rm -r dist/*
python -m pip install --upgrade setuptools wheel
python setup.py sdist bdist_wheel
python -m pip install --upgrade twine
python -m twine upload dist/*

Project details


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