DISQUS

Orestis Markou · 1 year ago

You might want to split up the double Meta: abstract = True in the last example.

Also, the DateAddedMixin is referenced in the first example, but it's not defined yet.

Good ideas overall! Model inheritance looks very good, I can see lots of "plugins" being created, in the :acts_as_* fashion that Rails has...

Eric Florenzano · 1 year ago

Whoops! Good catches, thanks. Fixing now.

Thierry Schellenbach · 1 year ago

I came from a Symfony background and am glad to see this kind of functionality in Django :)
It is quite similar in purpose to propel behaviors for Symfony :)

sean · 1 year ago

model inheritance would really help me a lot in designing models!

mb0 · 1 year ago

what about adding another method datemixin_save that is called by default? clients can override the save method and only need to call the mixin save method of the parent class... easy enough, but not tested.

Eric Flo · 1 year ago

You know, that's a really great idea. This could be done automatically with a small patch to Model.save(). Maybe I'll write up a patch later!

kevin · 1 year ago

eric, great post. looking forward to some interesting implementations in the future.

also, we're talking model inheritance this week at django-nyc meetup, and we now have another great reference/discussion point.

cheers!

Anonymous · 1 year ago

Could someone show how to use the DateMixin alone?

Alex · 1 year ago

You just subclass it alone, the behavior is self contained.

Carl Meyer · 1 year ago

You don't give the DateMixin enough credit. I've been using something very much like that in production ever since qs-rf merged. Anytime any model overrides save() it should use super() to call the default save() from models.Model. If that model is now a subclass of DateMixin instead of Model, the identical super() call will call DateMixin.save(), which will in turn call Model.save() - in other words, it all just works. The subclass doesn't need to do anything different than it would if subclassing Model normally.

hachaboob · 1 year ago

Nice example! An excellent way to stay DRYer in the model.

anon · 1 year ago

BlogPost.tree.get_roots() generates an attribute error for me on django revision 7538, anybody experiencing this...

AttributeError: 'Options' object has no attribute '_join_cache' happens in

'''
/usr/local/lib/python2.5/site-packages/django/db/models/sql/query.py in setup_joins(self, names, opts, alias, dupe_multis, allow_many, allow_explicit_fk, can_reuse)
1121 opts.pk.column), exclusions=joins)
1122 joins.append(alias)
-> 1123 cached_data = opts._join_cache.get(name)
1124 orig_opts = opts
1125
'''

anon · 1 year ago

BlogPost.tree.get_roots() does work when tree = NaiveHierarchyManager() is defined under BlogPost

Eric Florenzano · 1 year ago

Yes, this a result of the manager which doesn't yet work with Django trunk. I still suggest checking out

http://code.djangoproject.com/ticket/7252
and http://code.djangoproject.com/ticket/7154

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