Awesome

pyramid_deferred_sqla

Opinionated SQLAlchemy + Pyramid integration with deferred configuration in mind.

To start with, configure db module and configure SQLAlchemy engine and Alembic:

config.include("pyramid_deferred_sqla")
config.sqlalchemy_engine()
config.alembic_config("mypackage:migrations")

Both are going to use database.url from the registry settings to configure the URL of the engine.

The configuration also:

a) Sets up request.db attribute defaulting to SQLAlchemy Session instance.

c) Exposes listens_for pyramid decorator that defers sqlalchemy.event.listen

d) Sets up "read only" serialization for request session for GET/OPTIONS/HEAD requests

This behavior can be overridden by passing read_only attribute to the @view_config:

@view_config(read_only=True)
def myview(request):
    ...

e) SQLA Session is attached to pyramid_tm transaction manager and uses pyramid_retry.

f) Exposes Model that ties abstract class with id column as uuid primary key and sane repr implementation

g) Defers automagic Base metaclass logic to take place within pyramid Configurator

from pyramid_deferred_sqla import Base, model_config, Model

@model_config(Base)
class User(Model):
    __tablename__ = 'user'

    ...

which is registered by calling config.scan('.model').

A full-blown example app, with tests, based on this package is available at https://github.com/teamniteo/pyramid-realworld-example-app.

$ tox