1👍
well I finally get it works here is what I did:
class AlbumResource(ModelResource):
cover_img = fields.ForeignKey('album.api.ImageResource','cover_img')
class Meta:
always_return_data=True
queryset = Album.objects.all()
resource_name = 'album'
authorization = AlbumAuthorization()
def dehydrate(self, bundle):
im = get_thumbnail(bundle.obj.cover_img.src, '200x200', quality=90)
bundle.data['cover_thumb'] = im.url
return bundle
Source:stackexchange.com