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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