The issue was with my model which had a unique_together with the field
removed in it. Fixed migrations are:
class Migration(migrations.Migration):
operations = [
migrations.AddField(
model_name='Rendition',
name='filter2',
field=models.CharField(max_length=255, db_index=True),
),
migrations.RunPython(forwards_data_migration, reverse_data_migration
),
migrations.AlterUniqueTogether('rendition', set([])),
migrations.RemoveField(model_name='Rendition', name='filter'),
migrations.DeleteModel('Filter'),
migrations.RenameField(model_name='Rendition', old_name='filter2',
new_name='filter'),
migrations.AlterUniqueTogether('rendition', set([('image', 'filter',
'focal_point_key')])),
]
On Wednesday, 8 June 2016 11:32:48 UTC+2, Gagaro wrote:
>
> Hello,
>
> I'm trying to make a migration to change a field ("filter") from a
> ForeignKey to a CharField. The migration is as follow :
>
> class Migration(migrations.Migration):
>
> operations = [
> migrations.AddField(
> model_name='Rendition',
> name='filter2',
> field=models.CharField(max_length=255, db_index=True),
> ),
> migrations.RunPython(forwards_data_migration,
> reverse_data_migration),
> migrations.RemoveField(model_name='Rendition', name='filter'),
> migrations.DeleteModel('Filter'),
> migrations.RenameField(model_name='Rendition', old_name='filter2',
> new_name='filter'),
> ]
>
> When running the migration, I have the following error:
>
> django.core.exceptions.FieldDoesNotExist: Rendition has no field named
>> u'filter'
>>
>
> The error happens during the RemoveField (migrations.RemoveField(
> model_name='Rendition', name='filter')).
>
> So, a couple questions:
>
> * Is there a better way to change a field type (with data migration)?
> * Why do I have this error, when my field is present?
>
> The migration can be found there:
> https://github.com/Gagaro/wagtail/blob/02f4804b49d6f8b65ffb193d7a0dfc7872d323bd/wagtail/wagtailimages/migrations/0014_remove_filter_model.py
> And the relevant model is there:
> https://github.com/Gagaro/wagtail/blob/02f4804b49d6f8b65ffb193d7a0dfc7872d323bd/wagtail/wagtailimages/models.py#L458-L516
>
> Thanks
>
>
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