Assorted utility functions to support working with SQLAlchemy.
Function auto_session(func)
Decorator to run a function in a session is not presupplied.
Class ORM
A convenience base class for an ORM class.
This defines a .Base attribute which is a new DeclarativeBase
and provides various Session related convenience methods.
Subclasses must define their own .Session factory in
their own __init__, for example:
self.Session = sessionmaker(bind=engine)
Function orm_auto_session(method)
Decorator to run a method in a session derived from self.orm
if a session is not presupplied.
Intended to assist classes with a .orm attribute.
Function with_session(func, *a, orm=None, session=None, **kw)
Call func(*a,session=session,**kw), creating a session if required.
This is the inner mechanism of @auto_session and
ORM.auto_session_method.
Parameters:
func: the function to calla: the positional parametersorm: optional ORM class with a.session()context manager methodsession: optional existing ORM session
One of orm or session must be not None; if session
is None then one is made from orm.session() and used as
a context manager. The session is also passed to func as
the keyword parameter session to support nested calls.
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