For a slow model I added caching fields into my Django model with fields that are updated on save. New datasets now have the cached fields but I needed to update the old ones. The table is pretty big, so I wanted a progressbar. For the progressbar I used tqdm. The second problem is, that the Django model save method returns None and for a lot of elements this is a pretty big list of them. The Python build-in library collections for the rescue. The method deque avoids storing all the elements (because of maxlen=0).
The code I ran in my shell_plus:
import collections from tqdm import tqdm iterator = map(lambda x: x.save(), Claim.objects.all()) with tqdm(iterator, total=Claim.objects.count(), ascii=True) as pbar: collections.deque(pbar, maxlen=0)
For really big tables, the initial creation of the iterator will take quite some time too!