Looking deeper, Mezzanine seems to be simply looking for the field type,
then passing the arguments into the Django method contribute_to_class for
the sender model. (See
http://blog.jupo.org/2011/11/10/django-model-field-injection/). I'm going
to pursue this further, but it looks like Django itself may be broken when
it comes to ManyToManyField.
On Tuesday, March 17, 2015 at 12:12:55 AM UTC-6, Alexander Kominek wrote:
>
> I'm seeing the same thing, trying to ad a ManyToManyField to all pages.
> From my settings.py:
>
> EXTRA_MODEL_FIELDS = (
> (
> "mezzanine.pages.models.Page.blog_categories", #let blog posts
> be displayed below content on pages
> "ManyToManyField",
> ("blog.BlogCategory",),
> {"related_name":'pages',
> "blank":True,
> "null":True,},
> ),
> )
>
> When I run python manage.py schemamigration pages --auto I get the
> following error:
>
> Traceback (most recent call last):
> File "/path/to/myproject/manage.py", line 28, in <module>
> execute_from_command_line(sys.argv)
> File "/path/to/python2.7/django/core/management/__init__.py", line 399,
> in execute_from_command_line
> utility.execute()
> File "/path/to/python2.7/django/core/management/__init__.py", line 392,
> in execute
> self.fetch_command(subcommand).run_from_argv(self.argv)
> File "/path/to/python2.7/django/core/management/base.py", line 242, in
> run_from_argv
> self.execute(*args, **options.__dict__)
> File "/path/to/python2.7/django/core/management/base.py", line 285, in
> execute
> output = self.handle(*args, **options)
> File "/path/to/python2.7/south/management/commands/schemamigration.py",
> line 159, in handle
> action.add_forwards(forwards_actions)
> File "/path/to/python2.7/south/creator/actions.py", line 39, in
> add_forwards
> forwards.append(self.forwards_code())
> File "/path/to/python2.7/south/creator/actions.py", line 524, in
> forwards_code
> "left_field": self.field.m2m_column_name()[:-3], # Remove the _id part
> TypeError: 'NoneType' object has no attribute '__getitem__'
>
>
> I've tried
>
> On Tuesday, February 3, 2015 at 11:34:20 AM UTC-7, [email protected]
> wrote:
>>
>>
>> Hi everyone,
>>
>> I'm getting the same error exactly while running the schemamigration
>> command:
>>
>> TypeError: 'NoneType' object has no attribute '__getitem__'
>>
>>
>> In my case the model is cartridge.shop.models.Product but the situation
>> is really really close:
>>
>> EXTRA_MODEL_FIELDS = (
>> # Four-item sequence for one field injected.
>> (
>> # Dotted path to field.
>> "cartridge.shop.models.Product.tags",
>> # Dotted path to field class.
>> "ManyToManyField",
>> # Positional args for field class.
>> ('theme.Tag', ),
>> # Keyword args for field class.
>> {"related_name": "products", "blank": True, "null": True},
>> ),
>> )
>>
>> And the theme.Tag model is:
>>
>> class Tag(models.Model):
>> """
>> """
>> nome = models.CharField(_("Nome"), blank=True, max_length=100)
>>
>>
>> Has anyone found the problem or what's wrong with this setup?
>>
>> Thank you,
>> Maurizio
>>
>>
>> Il giorno venerdì 1 agosto 2014 16:59:19 UTC+2, Ryan Sadwick ha scritto:
>>>
>>> Make sure you run a south schemamigration on the blog app itself:
>>>
>>> Something like:
>>> manage.py schemamigration blog --auto
>>>
>>>
>>>
>>>
>>>
>>> On Tuesday, July 29, 2014 10:14:18 AM UTC-4, Beau Severson wrote:
>>>>
>>>> I was also wondering the answer to this. I'm trying to add a new M2M
>>>> field to the BlogPost model and I keep getting the exact same error. Is
>>>> this a bug for mezzanine using south? My EXTRA_MODEL_FIELDS contains the
>>>> following:
>>>>
>>>> (
>>>> "mezzanine.blog.models.BlogPost.industry",
>>>> "ManyToManyField", # type of field to add
>>>> ("users.Industry",),
>>>> {"blank": True, "null": True},
>>>> ),
>>>>
>>>> Everytime I attempt the migration though I get the same error you are
>>>> seeing.
>>>>
>>>> On Friday, January 11, 2013 8:40:05 AM UTC-6, Sam wrote:
>>>>>
>>>>>
>>>>> Hello,
>>>>>
>>>>> In the admin interface i would like it to be possible to select
>>>>> multiple genres for blogposts. These genres are from a different model so
>>>>> I
>>>>> used the technique described in the manual.
>>>>>
>>>>> I try to add a custom ManyToManyField to the blog app using the
>>>>> following syntax in my settings.py:
>>>>>
>>>>> (
>>>>> "mezzanine.blog.models.BlogPost.genre",
>>>>> "ManyToManyField",
>>>>> ('blog_custom.Genre',),
>>>>> {"null":True, "blank": True,},
>>>>> ),
>>>>>
>>>>> I started a custom app called blog_custom where I'd like to store the
>>>>> migrations. I have defined my Genre model as follows:
>>>>>
>>>>> class Genre(models.Model):
>>>>> name = models.CharField(max_length=300)
>>>>>
>>>>> Given the fact that I use South in this project, I have to perform a
>>>>> migration at which point I get the following error:
>>>>> TypeError: 'NoneType' object has no attribute '__getitem__'
>>>>>
>>>>> After some investigation I found out that this issue might actually be
>>>>> related to South, or related to the way the arguments are passed on from
>>>>> mezzanine to South. If I, for example, create the intermediare table that
>>>>> should have been created with the migration manually, and run the
>>>>> migration
>>>>> after this fact, it does complete since south does not have to create it.
>>>>> The problem with this approach is that Django will not use this
>>>>> intermediary model in the admin interface, which is what I need.
>>>>>
>>>>> Any thoughts?
>>>>>
>>>>> Thanks
>>>>>
>>>>
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