(Apologies for the vague subject; I couldn't think how to summarise this :P)
Hello all,
I have an application where some models are inherited from others, like so:
Foo
/ \
Bar Baz
Each object has (or may have) a parent object, which is a Foo (it might be a Bar
or a Baz, or some other subclass, but it's definitely a Foo). I'd like to be
able to find the children of an object, both overall and by subclass, using
'foo_object.children.all()', or 'foo_object.bars.all()' and so on.
Originally I set up parent links in Foo, as something like
"parent=models.ForeignKey('self', related_name='children')", but when I realised
that I mostly want to get the children in groups, I changed the way I was doing
this. Now I have per-class links like "parent=models.ForeignKey('Foo',
related_name='bars')", etc. This allows me to have the parent/child hierarchy
that I want, and access the children in the appropriate groups, but it feels
rathr ugly, and I'd still like an aggregate 'children' set so that I don't have
to use each set individually (and update every use if I ever add new
subclasses).
Additionally, I don't know if I'll need this, but I'm interested in how I might
get a link to 'children_of_same_type', so in Foo it would be an alias to
'children', but in Bar it would be an alias to 'bars', etc. I can't just do
'children_of_same_type = bars' because 'bars' is autogenerated so hasn't been
defined yet.
I hope that makes sense, but if not I can come up with a few more examples to
try to clarify it.
Does anybody have any suggestions as to how I should structure this? Would I be
best to leave the parent links as they are and define custom Managers for
'children' and 'children_of_same_type'? If so, pointers on how to go about this
would be appreciated.
Thanks,
Nye
--~--~---------~--~----~------------~-------~--~----~
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
django-users+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
