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copied!<p>This no longer works in Django 1.3 as CollectedObjects was removed. See <a href="http://code.djangoproject.com/changeset/14507" rel="noreferrer">changeset 14507</a></p> <p><a href="http://www.djangosnippets.org/snippets/1282/" rel="noreferrer">I posted my solution on Django Snippets.</a> It's based heavily on the <a href="http://code.djangoproject.com/browser/django/trunk/django/db/models/query.py#L33" rel="noreferrer"><code>django.db.models.query.CollectedObject</code></a> code used for deleting objects:</p> <pre><code>from django.db.models.query import CollectedObjects from django.db.models.fields.related import ForeignKey def duplicate(obj, value, field): """ Duplicate all related objects of `obj` setting `field` to `value`. If one of the duplicate objects has an FK to another duplicate object update that as well. Return the duplicate copy of `obj`. """ collected_objs = CollectedObjects() obj._collect_sub_objects(collected_objs) related_models = collected_objs.keys() root_obj = None # Traverse the related models in reverse deletion order. for model in reversed(related_models): # Find all FKs on `model` that point to a `related_model`. fks = [] for f in model._meta.fields: if isinstance(f, ForeignKey) and f.rel.to in related_models: fks.append(f) # Replace each `sub_obj` with a duplicate. sub_obj = collected_objs[model] for pk_val, obj in sub_obj.iteritems(): for fk in fks: fk_value = getattr(obj, "%s_id" % fk.name) # If this FK has been duplicated then point to the duplicate. if fk_value in collected_objs[fk.rel.to]: dupe_obj = collected_objs[fk.rel.to][fk_value] setattr(obj, fk.name, dupe_obj) # Duplicate the object and save it. obj.id = None setattr(obj, field, value) obj.save() if root_obj is None: root_obj = obj return root_obj </code></pre>

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