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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