Hi Nico,
I had the same problem when I was using this storage object:
photoStorage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT,
'photos/original'), base_url='/photos/original')
class Photo(models.Model):
image = models.ImageField(storage=photoStorage)
The "location" argument ends up being serialized, which makes the
migrations dependent on MEDIA_ROOT. To fix the problem I wrote my own
subclass of FileSystemStorage:
@deconstructible
class PhotoFileSystemStorage(FileSystemStorage):
def __init__(self, photoPath):
self.photoPath = photoPath
super(PhotoFileSystemStorage,self).__init__(location=os.path.join(settings.MEDIA_ROOT,
self.photoPath), base_url=self.photoPath)
def __eq__(self, other):
return self.photoPath == other.photoPath
photoStorage = PhotoFileSystemStorage('photos/original')
When an instance of PhotoFileSystemStorage is serialized it just writes out
self.photoPath, which does not depend on MEDIA_ROOT. After implementing
this, the migration looks like this:
class Migration(migrations.Migration):
dependencies = [
...
]
operations = [
migrations.AlterField(
model_name='photo',
name='image',
field=models.ImageField(storage=myapp.models.PhotoFileSystemStorage(b'photos/original')),
),
]
You can see it does not depend on MEDIA_ROOT and won't be different if you
move the project around or deploy it.
The django docs on this are
here: https://docs.djangoproject.com/en/1.8/topics/migrations/
Hope this helps.
Steve
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