Clean slidedecks asset by removing invalid deck_ids

clean-deck-asset.py

import json
import models
from google.appengine.ext import ndb

opaqueID = '9f3cccbe-ee94-4bd6-9ba6-96efb1967ae4'

deck_asset = models.DBAsset.all().filter('opaqueID = ', opaqueID).filter('assetType = ', 'slidedecks').get()
asset = json.loads(deck_asset.asset)

keys = [ndb.Key(models.SlideDeck, id) for id in asset["deck_ids"]]
decks = ndb.get_multi(keys)
valid_deck_ids = []
for deck in decks:
  if deck is None: continue
  print deck.deck_id, deck.deck_url
  valid_deck_ids.append(deck.deck_id)

# Filter out invalid deck_ids:
asset["deck_ids"] = valid_deck_ids
deck_asset.asset = json.dumps(asset)

# Update deck asset:
deck_asset.put()