sqlalchemy-api-handler

SQLAlchemy-Api-Handler is an extension that adds support for handling apis with sqlalchemy. It helps to handle models with humanized ids once it is jsonified, throws api errors for some casting of value during the save time, and dictifies model objects into jsonified ones.

[](https://circleci.com/gh/betagouv/sqlalchemy-api-handler/tree/master) [](https://coveralls.io/github/betagouv/sqlalchemy-api-handler)

Installing

Install and update using pip:

$ pip install -U SQLAlchemy-Api-Handler

A Simple Example

Suppose a request POST /users {"email": "[email protected]", name: "Marx Foo"} :

from flask import Flask, jsonify, request
from sqlalchemy_api_handler import ApiHandler

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///example.sqlite"
db = SQLAlchemy(app)
ApiHandler.set_db(db)

class User(ApiHandler, db.Model):
    email = db.Column(db.String, unique=True, nullable=False)
    name = db.Column(db.String, unique=True, nullable=False)

@app.route('/users', methods=['POST'])
def post_user():
  user = User(**request.form)
  ApiHandler.save(user)
  return jsonify(as_dict(user))

The success result will have stored a user object at, let's say id = 32, and so will fetch an object at humanized id = humanize(32), ie

{"id": "EA", "email": "[email protected]", name: "Marx Foo"}

Playing with nesting data

Suppose a request GET /offers

from flask import Flask, jsonify, request
from sqlalchemy.orm import relationship
from sqlalchemy_api_handler import ApiHandler

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///example.sqlite"
db = SQLAlchemy(app)
ApiHandler.set_db(db)

class Venue(ApiHandler, db.Model):
    address = db.Column(db.String, unique=True, nullable=False)
    name = db.Column(db.String, unique=True, nullable=False)

class Offer(ApiHandler, db.Model):
    name = db.Column(db.String, unique=True, nullable=False)
    venueId = db.Column(db.BigInteger,
                 db.ForeignKey("venue.id"),
                 nullable=False,
                 index=True)
    venue = relationship('Venue',
                         foreign_keys=[venueId],
                         backref='offers')

class Stock(ApiHandler, db.Model):
    available = db.Column(db.Integer, nullable=False)
    offerId = db.Column(db.BigInteger,
                     db.ForeignKey('offer.id'),
                     index=True,
                     nullable=False)
    offer = relationship('Offer',
                         foreign_keys=[offerId],
                         backref='stocks')

venue = Venue(address="Somewhere I belong", name="MyVenue")
offer = Offer(name="MyOffer")
stock = Stock(available=10)
stock.offer = offer
offer.venue = venue
ApiHandler.save(stock)

offer_includes = [
  'stocks',
  {
    "key": 'venue',
    "includes": [
      '-address'
    ]
  }
]

@app.route('/offers', methods=['GET'])
def get_offers():
  offers = Offer.query.all()
  return jsonify(as_dict(offers, includes=offer_includes))

The success will return

[
  {
    "id": "AE",
    "name": "MyOffer",
    "stocks": [
      {
        "available": 10,
        "id": "AE"
      }
    ],
    "venue": {
      "name": "MyVenue"
    }
  }
]

Links

• Documentation: https://sqlalchemy-api-handler.betagouv.fr/
• Releases: https://pypi.org/project/SQLAlchemy-Api-Handler/
• Code: https://github.com/betagouv/sqlalchemy-api-handler
• Issue tracker: https://github.com/betagouv/sqlalchemy-api-handler/issues
• Test status: https://travis-ci.org/betagouv/sqlalchemy-api-handler
• Test coverage: https://codecov.io/gh/betagouv/sqlalchemy-api-handler
• Flask: https://betagouvprojects.com/p/flask/
• SQLAlchemy: https://www.sqlalchemy.org
• pip: https://pip.pypa.io/en/stable/quickstart/

Deploy

First, make sure that the deploy environment is started:

./sqlaah start

In a second tab, then:

2. Change the __version__ into sqlalchemy_api_handler/__init__.py
3. Pre publish:

./sqlaah prepublish

4. Publish:

./sqlaah publish