Create and populate albums on Immich based on folder name (comaptible with Immich v1.95.x), moved to here: https://github.com/Salvoxia/immich-folder-album-creator

immich_auto_album.py

import requests
import os
import argparse
from collections import defaultdict


# I have photos in subfolders like : 
# /mnt/media/Photos/2023-08 Holidays
# /mnt/media/Photos/2023-06 Birthday
# /mnt/media/Photos/2022-12 Christmas
# This script will create 3 albums
# 2023-08 Holidays, 2023-06 Birthday, 2022-12 Christmas
# And populate them with the photos inside
# The script can be run multiple times to update, new albums will be created,
# or new photos added in existing subfolder will be added to corresponding album 

parser = argparse.ArgumentParser(description="Create Immich Albums from an external library path based on the top level folders", formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("root_path", help="The external libarary's root path in Immich")
parser.add_argument("api_url", help="The root API URL of immich, e.g. https://immich.mydomain.com/api/")
parser.add_argument("api_key", help="The Immich API Key to use")
parser.add_argument("-u", "--unattended", action="store_true", help="Do not ask for user confirmation after identifying albums. Set this flag to run script as a cronjob.")
parser.add_argument("-c", "--chunk-size", default=2000, type=int, help="Maximum number of assets to add to an album with a single API call")
parser.add_argument("-C", "--fetch-chunk-size", default=5000, type=int, help="Maximum number of assets to fetch with a single API call")
args = vars(parser.parse_args())

root_path = args["root_path"]
root_url = args["api_url"]
api_key = args["api_key"]
number_of_images_per_request = args["chunk_size"]
number_of_assets_to_fetch_per_request = args["fetch_chunk_size"]
unattended = args["unattended"]

# Yield successive n-sized 
# chunks from l. 
def divide_chunks(l, n): 
      
    # looping till length l 
    for i in range(0, len(l), n):  
        yield l[i:i + n] 
  

requests_kwargs = {
    'headers' : {
        'x-api-key': api_key,
        'Content-Type': 'application/json',
        'Accept': 'application/json'
    }
}
if root_path[-1] != '/':
    root_path = root_path + '/'
if root_url[-1] != '/':
    root_url = root_url + '/'


print("  1. Requesting all assets")
assets = []
# Initial API call, let's fetch our first chunk
r = requests.get(root_url+'asset?take='+str(number_of_assets_to_fetch_per_request), **requests_kwargs)
assert r.status_code == 200
assets = assets + r.json()

# If we got a full chunk size back, let's perfrom subsequent calls until we get less than a full chunk size
skip = 0
while len(r.json()) == number_of_assets_to_fetch_per_request:
    skip += number_of_assets_to_fetch_per_request
    r = requests.get(root_url+'asset?take='+str(number_of_assets_to_fetch_per_request)+'&skip='+str(skip), **requests_kwargs)
    if skip == number_of_assets_to_fetch_per_request and assets == r.json():
        print("Non-chunked Immich API detected, stopping fetching assets since we already got all in our first call")
        break
    assert r.status_code == 200
    assets = assets + r.json()
print(len(assets), "photos found")



print("  2. Sorting assets to corresponding albums using folder name")
album_to_assets = defaultdict(list)
for asset in assets:
    asset_path = asset['originalPath']
    if root_path not in asset_path:
        continue
    album_name = asset_path.replace(root_path, '').split('/')[0]
    # Check that the extracted album name is not actually a file name in root_path
    if not asset_path.endswith(album_name):
        album_to_assets[album_name].append(asset['id'])

album_to_assets = {k:v for k, v in sorted(album_to_assets.items(), key=(lambda item: item[0]))}

print(len(album_to_assets), "albums identified")
print(list(album_to_assets.keys()))
if not unattended:
    print("Press Enter to continue, Ctrl+C to abort")
    input()


album_to_id = {}

print("  3. Listing existing albums on immich")
r = requests.get(root_url+'album', **requests_kwargs)
assert r.status_code == 200
albums = r.json()
album_to_id = {album['albumName']:album['id'] for album in albums }
print(len(albums), "existing albums identified")


print("  4. Creating albums if needed")
cpt = 0
for album in album_to_assets:
    if album in album_to_id:
        continue
    data = {
        'albumName': album,
        'description': album
    }
    r = requests.post(root_url+'album', json=data, **requests_kwargs)
    assert r.status_code in [200, 201]
    album_to_id[album] = r.json()['id']
    print(album, 'album added!')
    cpt += 1
print(cpt, "albums created")


print("  5. Adding assets to albums")
# Note: immich manage duplicates without problem, 
# so we can each time ad all assets to same album, no photo will be duplicated 
for album, assets in album_to_assets.items():
    id = album_to_id[album]
    
    assets_chunked = list(divide_chunks(assets, number_of_images_per_request))
    for assets_chunk in assets_chunked:
        data = {'ids':assets_chunk}
        r = requests.put(root_url+f'album/{id}/assets', json=data, **requests_kwargs)
        if r.status_code not in [200, 201]:
            print(album)
            print(r.json())
            print(data)
            continue
        assert r.status_code in [200, 201]
        response = r.json()

        cpt = 0
        for res in response:
            if not res['success']:
                if  res['error'] != 'duplicate':
                    print("Warning, error in adding an asset to an album:", res['error'])
            else:
                cpt += 1
        if cpt > 0:
            print(f"{str(cpt).zfill(3)} new assets added to {album}")

print("Done!")

Hm, for me it detected all of my 229 albums.
Has the script detected more albums than that with a previous version of Immich?
Are all of your folders on the same level as the 12 ones it detected, i.e. in root_path? The script does not create albums for nested folders.

Yes. All 63 Folders in the same root.
The old script did find the 2022.10 but the new one now only detects 2022-10

Ah, that's a good hint! If all of your missing folders contain a ., that should now be fixed in the updated revision of the script.
I added a check to prevent albums being created from files lying around in root_path, and that check accidentally also filtered out folders containing a ..

Maintenance and development of this script has been moved to this repository: Salvoxia/immich-folder-album-creator