Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!

SQLAlchemy dependency for nameko services

Project Description

A SQLAlchemy dependency for nameko, enabling services to interface with a relational database.

Usage

from nameko_sqlalchemy import Session

from .models import Model, DeclarativeBase

class Service(object):

    session = Session(DeclarativeBase)

    @entrypoint
    def write_to_db(self):
        model = Model(...)
        self.session.add(model)
        self.session.commit()

    @entrypoint
    def query_db(self):
        queryset = self.session.query(Model).filter(...)
        ...

Database drivers

You may use any database driver compatible with SQLAlchemy provided it is safe to use with eventlet. This will include all pure-python drivers. Known safe drivers are:

Pytest fixtures

Pytest fixtures to allow for easy testing are available.

  • db_session fixture (which depends on db_connection fixture) will instantiate test database and tear it down at the end of each test.
  • model_base fixture can be overridden to provide custom declarative_base.
  • db_engine_options fixture can be overriden to provide additional keyword arguments to sqlalchemy.create_engine.
import pytest

from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base


class Base(object):
    pass


DeclarativeBase = declarative_base(cls=Base)


class User(DeclarativeBase):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    name = Column(String)


@pytest.fixture(scope='session')
def model_base():
    return DeclarativeBase


@pytest.fixture(scope='session')
def db_engine_options():
    return dict(client_encoding='utf8')


def test_users(db_session):
    user = User(id=1, name='Joe')
    db_session.add(user)
    db_session.commit()
    saved_user = db_session.query(User).get(user.id)
    assert saved_user.id > 0
    assert saved_user.name == 'Joe'

When running tests you can pass database test url with --test-db-url parameter or override db_url fixture. By default SQLite memory database will be used.

py.test test --test-db-url=sqlite:///test_db.sql
Release History

Release History

This version
History Node

0.1.0

History Node

0.0.4

History Node

0.0.3

History Node

0.0.2

History Node

0.0.1

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
nameko-sqlalchemy-0.1.0.tar.gz (5.0 kB) Copy SHA256 Checksum SHA256 Source Feb 20, 2017

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting