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I have the following Django model that extends the Post model from django basic blog:

from django.basic.blog.models import Post
from l10n.utils import lookup_translation

class ExtendedPost(Post):
    class Meta:
        proxy = True
    def translated_title(self, language_code=None):
        return lookup_translation(self, 'title', language_code)

I'm trying to use django basic blog's view by just overriding their template and making use of the new ExtendedPost behaviour in there:

{{ post.extendedpost.translated_title }}

But obviously this doesn't work because you can't just access a subclass like that. How DO you do this type of thing?

pancakes
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2 Answers2

1

Well, the view would still be referencing the original model, so you'd have to modify the view to pass in the ExtendedPost class.

You can't just define a proxy model and have it magically override the parent class.

  1. Untested idea based on: Can django's auth_user.username be varchar(75)? How could that be done?

    from django.db.models.signals import class_prepared

def add_func(sender, *args, **kwargs):
    if sender.__name__ == "Post" and sender.__module__ == "django-basic-blog-module":
        sender.translated_title = lambda self, language_code=None: lookup_translations(self, 'title', language_code)

class_prepared.connect(add_func)

  2. Override sys.modules

    import sys
from django.basic.blog import models

models.Post.translated_title = lambda self, language_code=None: lookup_translations(self, 'title', language_code)
Community
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Yuji 'Tomita' Tomita
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  • Is there a way to modify (reuse) the view without redefining it in my own code? I still want to pick up changes to the django-basic-blog app later on, and don't want to have to merge those changes every time I do. – pancakes Feb 27 '11 at 05:37
  • Understood. Updating post with 2 solutions – Yuji 'Tomita' Tomita Feb 27 '11 at 05:41
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You can make

{{ post.extendedpost.translated_title }}

work if you use multi-table inheritance rather than a proxy model.

However, introducing a whole new table just to add a function doesn't make a whole lot of sense.

pancakes
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