models.py 文件源码

def create_new_thumb(media_path, instance, owner_slug, max_length, max_width):
    filename = os.path.basename(media_path)
    thumb = Image.open(media_path)
    size = (max_length, max_width)
    thumb.thumbnail(size, Image.ANTIALIAS)

    temp_loc = "%s/%s/tmp" %(settings.MEDIA_ROOT, owner_slug)

    if not os.path.exists(temp_loc):
        os.makedirs(temp_loc)

    temp_file_path = os.path.join(temp_loc, filename)
    if os.path.exists(temp_file_path):
        temp_path = os.path.join(temp_loc, "%s" %(random.random()))
        os.makedirs(temp_path)
        temp_file_path = os.path.join(temp_path, filename)

    temp_image = open(temp_file_path, "w")
    thumb.save(temp_image)
    thumb_data = open(temp_file_path, "r")

    thumb_file = File(thumb_data)
    instance.media.save(filename, thumb_file)
    shutil.rmtree(temp_loc, ignore_errors=True)
    return True