migrate "traditional" image fields to FilerImageField

migrate_filer.py

# encoding: utf-8
from django.core.management.base import BaseCommand

##
## FancyImageModel is a plugin model holding a ImageField called "oldimage" and
## FilerImageField "image". It removed duplicates based on the basename of the original
## image. This may or may not work for you.

from imageplugin.models import FancyImageModel

from filer.models.imagemodels import Image
import os

class Command(BaseCommand):
    args = ""
    help = ""

    def handle(self, *args, **options):
        fancies = FancyImageModel.objects.all()
        name_image_map = {}
        for fancy in fancies:
            if fancy.image is None:
                print fancy.oldimage, "needs migration"
                name = os.path.basename(fancy.oldimage.name)
                i = name_image_map.get(name)

                if i is None:
                    print "creating ", name
                    i = Image(
                        file=fancy.oldimage.name,
                        height=fancy.oldimage.height,
                        width=fancy.oldimage.width,
                        author="migrated",
                        original_filename=os.path.basename(fancy.oldimage.name),
                        )
                    i.save()
                    name_image_map[name] = i
                else:
                    print "already have ", name
                fancy.image = i
                fancy.save()