JHHAlchemy

Jawbone Health Flask-SQLAlchemy base model and mixins

Base Model Usage

To use the base model:

1. Set it as the model_class when creating the flask_sqlalchemy object:

import flask_sqlalchemy
import jhhalchemy.model

db = flask_sqlalchemy.SQLAlchemy(app, model_class=jhhalchemy.model.Base)

2. Your application's models should inherit from flask_sqlalchemy's Model and define Columns with SQLAlchemy's objects:

class MyModel(db.Model):
    my_id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True)

3. The Base.save and Base.delete methods require passing in a session object. In most cases use the the one from flask_sqlalchemy:

my_model = MyModel()
my_model.save(db.session)
my_model.delete(db.session)

TimeOrderMixin Usage

To use a jhhalchemy mixin, simply include it in your model's inheritance list:

import jhhalchemy.model.time_order

class MyTimeOrderModel(db.Model, jhhalchemy.model.time_order.TimeOrderMixin):
    """
    Define additional columns, etc.
    """
    my_col = db.Column(...)
    
    @classmethod
    def my_read_range(cls, my_col_value, start_timestamp, end_timestamp):
        cls.read_time_range(my_col == my_col_value, start_timestamp=start_timestamp, end_timestamp=end_timestamp)

TimeOrder Helper

The time_order mixin has a helper function called get_by_range. The module provides this function because we were writing some form of it for every model that used time_order. Here is an example of a model-specific wrapper:

def get_locations_by_range(uid, start_timestamp=None, end_timestamp=None):
    return jhhalchemy.model.time_order.get_by_range(
        jhhuser.models.location.Location,
        uid,
        start_timestamp=start_timestamp,
        end_timestamp=end_timestamp)

Migrations

The jhhalchemy.migrate module provides some utility functions to obtain database locks and safely run an Alembic upgrade:

jhhalchemy.migrate.upgrade(
    'my_database', 
    'mysql://root:root@0.0.0.0/my_database', 
    'alembic.ini')

Examples

Check out how the fixtures are created in tests/integration/conftest.py.

Tests

jhhalchemy includes unit and integration tests. Use pytest to run them. For the integration tests, you will need to set the MYSQL_CONNECTION_URI environment variable. You can find more details in the fixtures.