Django DAG
----------
Django-dag is a small reusable app which implements a Directed Acyclic Graph.
Usage
.....
Django-dag uses abstract base classes, to use it you must create your own
concrete classes that inherit from Django-dag classes.
The `dag_test` app contains a simple example and a unit test to show
you its usage.
Example::
class ConcreteNode(node_factory('ConcreteEdge')):
"""
Test node, adds just one field
"""
name = models.CharField(max_length = 32)
class ConcreteEdge(edge_factory(ConcreteNode, concrete = False)):
"""
Test edge, adds just one field
"""
name = models.CharField(max_length = 32, blank = True, null = True)