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SQLAlchemy dependency for nameko services

Project Description

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


from nameko_sqlalchemy import Session

from .models import Model, DeclarativeBase

class Service(object):

    session = Session(DeclarativeBase)

    def write_to_db(self):
        model = Model(...)

    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):

DeclarativeBase = declarative_base(cls=Base)

class User(DeclarativeBase):
    __tablename__ = "users"

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

def model_base():
    return DeclarativeBase

def db_engine_options():
    return dict(client_encoding='utf8')

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

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