The easiest way I've found to do this is to subclass models.ImageField
from django.db.models and override the save_file method. I have an
application where an artist uploads an image file - it makes a
thumbnail, and saves the file to a artist/book/chapter folder. I did
something like this (which basically moves the file after it's saved):
class KlangImageField(models.ImageField):
def save_file(self, new_data, new_object, original_object, change,
rel):
upload_field_name = self.get_manipulator_field_names('')[0]
if rel:
file_name = new_data[upload_field_name][0]["filename"]
else:
file_name = new_data[upload_field_name]["filename"]
media_location = settings.MEDIA_ROOT
file_location = os.path.join(media_location, file_name)
thumbnail_location = os.path.join(media_location,
thumbnail_name(file_name))
# if file already exists - delete the file and the thumbnail
if os.path.exists(file_location):
os.remove(file_location)
if os.path.exists(thumbnail_location):
os.remove(thumbnail_location)
# go ahead and save the file in the default MEDIA_ROOT
models.FileField.save_file(self, new_data, new_object,
original_object, change, rel)
# make the thumbnail
im = Image.open(file_location)
im.thumbnail((128,128),Image.ANTIALIAS)
im.save(thumbnail_location)
# now move the file - it should go in the book/$chapter folder
book = getattr(new_object, 'book')
artist = book.artist
chapter = getattr(new_object, 'chapter')
file_dir = os.path.dirname(file_location)
image_dir = os.path.join(file_dir, "images")
if chapter is None:
new_file_location = "%s/%s/%s/%s" % (image_dir,
artist.folder, book.folder, os.path.basename(file_location))
new_thumbnail_location = "%s/%s/%s/%s" % (image_dir,
artist.folder, book.folder, os.path.basename(thumbnail_location))
else:
new_file_location = "%s/%s/%s/%s/%s" % (image_dir,
artist.folder, book.folder, chapter.folder,
os.path.basename(file_location))
new_thumbnail_location = "%s/%s/%s/%s/%s" % (image_dir,
artist.folder, book.folder, chapter.folder,
os.path.basename(thumbnail_location))
new_file_dir = os.path.dirname(new_file_location)
if not os.path.exists(new_file_dir):
os.makedirs(new_file_dir)
os.rename(file_location, new_file_location)
os.rename(thumbnail_location, new_thumbnail_location)
I hope this makes sense. I can supply all the code (such as
make_thumbnail method) but I wanted to just post the relevent code.
The basic idea though is override save_file() and move the file after
it's saved (it's kludgy but I couldn't get it to work otherwise). If
someone knows a better way that would be great - cause I don't
particulary like this
Rob
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