backref is a callable within the sqlalchemy.orm module of the SQLAlchemy project.
ColumnProperty,
CompositeProperty,
Load,
Mapper,
Query,
RelationshipProperty,
Session,
SynonymProperty,
aliased,
attributes,
class_mapper,
column_property,
composite,
interfaces,
mapper,
mapperlib,
object_mapper,
object_session,
query,
relationship,
session,
sessionmaker,
and strategies
are several other callables with code examples from the same sqlalchemy.orm package.
sqlalchemy-datatables (PyPI package information) is a helper library that makes it easier to use SQLAlchemy with the jQuery JavaScript DataTables plugin. This library is designed to be web framework agnostic and provides code examples for both Flask and Pyramid.
The project is built and maintained by Michel Nemnom (Pegase745) and is open sourced under the MIT license.
sqlalchemy-datatables / tests / models.py
# models.py
import datetime
from sqlalchemy import Column, Date, DateTime, ForeignKey, Integer, String, func
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import backref, relationship
Base = declarative_base()
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(String, unique=True)
created_at = Column(DateTime, default=datetime.datetime.utcnow)
birthday = Column(Date)
address = relationship('Address', uselist=False, backref=backref('user'))
def __unicode__(self):
return '%s' % self.name
def __repr__(self):
return '<%s#%s>' % (self.__class__.__name__, self.id)
@hybrid_property
def dummy(self):
return self.name[0:3]
@dummy.expression
def dummy(cls):
return func.substr(cls.name, 0, 3)
class Address(Base):
__tablename__ = 'addresses'
id = Column(Integer, primary_key=True)
description = Column(String, unique=True)
user_id = Column(Integer, ForeignKey('users.id'))
## ... source file continues with no further backref examples...