On Aug 5, 12:32 am, v0idnull <v0idn...@gmail.com> wrote: > I want to be able to link one model to another model, regardless of > what models they are. Articles can be related to Photos, Videos, other > Articles, etc etc etc. > > I have created a Relationship model to represent these relationships, > but I'm unsure if this is the best solution. First off, my > requirements include having a title, description, type, and priority > to further describe the relationship. > > Secondly, I am using UUIDs for primary keys so I created a custom > field to represent this (postgresql has a UUID field as well). > > Thirdly, I don't plan on using the out-of-box admin console, so > whether or not a particular pattern works well in the admin console or > not is not relevant for me. > > The following model accurately represents what I need, and in theory > it works well. I can now have an abstract model that all my other > models inherit, with an addRelationship(self, destination) method and > various other methods to fetch relationships. In this abstract class, > I also have this: > > from django.contrib.contenttypes.models import ContentType > > class Abstract(models.Model): > ... > def getType(self): > if (self._type == None): > self._type = ContentType.objects.get_for_model(self) > return self._type > > In order to make my life easier, as you'll see in my model below. > > I would like opinions about my approach, I am new to python, and newer > still to Django. There might be things I am overlooking due to my > ignorance. > > class Relationship(models.Model): > > id = fields.UUID(auto_add=True,primary_key=True, unique=True) > created_by = fields.UUID(db_index=True,null=True,blank=True) > created_on = models.DateField(auto_now=False,auto_now_add=True) > modfied_on = models.DateField(auto_now=True,auto_now_add=False) > title = models.CharField(max_length=255) > > source_id = fields.UUID(db_index=True) > source_app_label = models.CharField(db_index=True,max_length=255) > source_model = models.CharField(db_index=True,max_length=255) > destination_id = fields.UUID(db_index=True) > destination_app_label = > models.CharField(db_index=True,max_length=255) > destination_model = models.CharField(db_index=True,max_length=255) > > description = models.TextField(null=True,blank=True) > type = > models.CharField(max_length=64,null=True,blank=True,db_index=True) > priority = models.PositiveIntegerField() > > Thanks in advance...
There is an out-of-the-box feature that does exactly this, Generic Relationships. See http://docs.djangoproject.com/en/1.2/ref/contrib/contenttypes/#generic-relations -- DR. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
