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    <p>Take a look at django's built-in <a href="http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#ref-contrib-contenttypes" rel="noreferrer">contenttypes framework</a>:</p> <p><code>django.contrib.contenttypes</code></p> <p>It allows you develop your applications as stand-alone units. This is what the django developers used to allow django's built-in <a href="http://docs.djangoproject.com/en/dev/ref/contrib/comments/#ref-contrib-comments-index" rel="noreferrer">comment framework</a> to attach a comment to any model in your project.</p> <p>For instance, if you have some content object that you want to "attach" to other content objects of different types, like allowing each user to leave a "favorite" star on a blog post, image, or user profile, you can create a <code>Favorite</code> model with a <a href="http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#generic-relations" rel="noreferrer">generic relation field</a> like so:</p> <pre><code>from django.db import models from django.contrib.auth.models import User from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic class Favorite(models.Model): user = models.ForeignKey(User) content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey('content_type', 'object_id') </code></pre> <p>In this way you can add a <code>Favorite</code> star from any user to any model in your project. If you want to add API access via the recipient model class you can either add a <a href="http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#reverse-generic-relations" rel="noreferrer">reverse generic relation field</a> on the recipient model (although this would be "coupling" the two models, which you said you wanted to avoid), or do the lookup through the <code>Favorite</code> model with the <code>content_type</code> and <code>object_id</code> of the recipient instance, see the <a href="http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#reverse-generic-relations" rel="noreferrer">official docs</a> for an example. </p>
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    1. COWhat about if I had both the blog app, and a "bookmarks" app, and wanted to use the generic comments app to let users post comments on both? Is there a way to do this, or would I have to write wrapper apps that inherited the comment model and overwrote comment.post?
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