anyway to implement this without changing 'boot/__init__' directly?
On Friday, February 20, 2015 at 4:50:57 PM UTC-5, Mathias Ettinger wrote:
>
> I guess it’s because both EXTRA_MODEL_FIELDS and strings referencing
> classes as ForeignKey positional argument rely on the class_prepared
> signal. But with it being only sent once, the ForeignKey doesn't have any
> chance to catch the signal in time.
>
> For every other use case other than a self-referencing ForeignKey, either
> the model being referenced has been created when the extra ForeignKey is
> added and it can be resolved as a class right away, or the ForeignKey will
> be able to resolve the class as soon as it send the class_prepared signal.
> In the case of a self-referencing extra ForeignKey, the ForeignKey is
> added after the class_prepared signal has been fired but can't resolve the
> string into a class yet because the model has not finished initializing. So
> the ForeignKey connect to the class_prepared signal and wait for the class
> that just fired it to fire it "again". In vain.
>
> One solution could be to re-raise the class_prepared signal after extra
> fields had been added to a model. To do so, you could change the
> add_extra_model_fields function in mezzanine/boot/__init__.py to:
> def add_extra_model_fields(sender, **kwargs):
> """
> Injects custom fields onto the given sender model as defined
> by the ``EXTRA_MODEL_FIELDS`` setting.
> """
> model_path = "%s.%s" % (sender.__module__, sender.__name__)
> extra_fields = fields.get(model_path, {})
> if (extra_fields):
> for field_name, field in extra_fields.items():
> field.contribute_to_class(sender, field_name)
> del fields[model_path]
> # re-send the class_prepared signal so self-referencing ForeignKey
> can catch up
> class_prepared.send(sender=sender)
>
>
> Le vendredi 20 février 2015 17:44:37 UTC+1, Kacper Kołodziej a écrit :
>>
>> Hi! I'm trying to create multi-level categories structure. I have added
>> ForeignKey to 'self' to BlogCategory. I've tried to do it in some different
>> ways: http://pastebin.com/77ex9ehe but none of them works. I always
>> receive error on syncdb:
>>
>> CommandError: One or more models did not validate:
>>> blog.blogcategory: 'parent_category' has a relation with model self,
>>> which has either not been installed or is abstract.
>>>
>>
>>
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