I've opened a ticket <https://code.djangoproject.com/ticket/19236> to track
this issue.
On Tuesday, October 23, 2012 3:52:10 AM UTC-7, Andrew Ingram wrote:
>
> Hi all,
>
> This one stung me today. Basically as part of an event (calendar) app, I
> have functionality for splitting a series of events into two at a given
> timestamp. The details aren't particularly relevant, but the key thing is
> that I had a method called "split" on one of the models.
>
> This was working fine until I tried to add a ManyToManyField to the same
> model, at which point it through a rather ugly error during initialisation
> of the apps.
>
> django/db/models/fields/related.py line 56, in add_lazy_relation
>> app_label, model_name = relation.split(".")
>> TypeError: unbound method split() must be called with RecurringEvent
>> instance as first argument (got str instance instead)
>
>
> Because I had no knowledge of the inner workings here, this error wasn't
> helpful until pdb told me that `relation` was an instance of my model. The
> issue is that in this point in the code, relation can either be a model or
> a string 'app_label.model_name', so it's using the presence of a split
> function to determine which it is, me having a split function on my model
> breaks this check. Having a non-callable 'split' causes a similar problem,
> just with a different exception.
>
> Long story short, adding a 'split' method to my model caused the
> inner-workings of Django to break, I think the documentation should provide
> a list of attribute names that can't be added to a Django model without
> breaking things, though this is the first time I've ever come across such a
> problem so it might be a one-off.
>
> Regards,
> Andrew Ingram
>
>
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