On a couple of occasions, I've had need for a model that links two instances of another model and I'm wondering about the best practices for doing this.
Abstractly, there's an undirected graph where both nodes and arcs are objects. Concretely, two examples are: 1) roads in django-mmo existing between two hubs but the roads aren't directed: A to B means the same as B to A 2) friendship in django-friends existing between two users where friendship is necessarily mutual: a Friends b => b Friends a Obviously this can be done with Road or Friendship having two foreign keys but (a) this leads to a superfluous related_name; (b) how do you best query a node for its arcs? If the arc were just a M2M field on the node, one could use symmetrical=True but it isn't clear to me the best way to do this where the arc/association is its own model. James -- James Tauber http://jtauber.com/ journeyman of some http://jtauber.com/blog/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
