Oh okay, apparently there is a ticket from 4 years ago
http://code.djangoproject.com/ticket/4459

On Mar 30, 5:21 pm, George Karpenkov <true.chesh...@gmail.com> wrote:
> If we'll look into core/management/commands/loaddata we'll see the
> line
> "obj.save(using=using)" which saves the data.
>
> *however* consider the case when application has some custom database-
> altering logic in .save method. The common thing that comes to mind is
> timestamp, or something similar. What would happen is that instead of
> loading data the data from the fixture will be partly changed, which
> is really not what you want.
>
> That's not the worst case though - I've just spent 40 minutes loading
> the database from a fixture which contained data in django-tagging,
> which inserts it's own "INSERT" SQL statements into save. So loaddata
> was consistently crashing with "column blah is not unique" while the
> data from the dump was perfectly fine. It made me quite sad.
>
> so coming to think of it i can't really think of a use case where
> you'd want the custom logic in .save() to be executed. All the data is
> already there, and we *know* that it is valid data - so what else we
> might possibly want to do with it? (unless our application
> communicates over network with different services and it uses .save()
> to maintain integrity with them, but I haven't seen a single django
> website like that)
> So I think that some lower-level logic should be called instead.
>
> Any comments on why loaddata was implemented this way in the first
> place?

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