CODEWITHSUNDEEP
pythongoogle-app-enginegoogle-cloud-datastore
Rusty Rob
Rusty Rob

Reputation: 17173

how to delete an entity with blobkeys from google app engine datastore

What's the best practice for deleting an ndb entity that contains blob keys?

Should I wrap this in a try catch? Can I flatten the for loop into a batch (though ndb is asnyc)?

This is what I've tried so far but i'm not sure if it's the best way:

to_delete = BlogPost.query(ancestor=ndb.Key('BlogPost', int(id))).fetch(1)[0]
for blob_key in to_delete.blob_keys:
    info = blobstore.BlobInfo(bob_key)
    info.delete()
to_delete.key.delete()
delete_success = "successfully deleted"

self.response.out.write(delete_success)

Upvotes: 0

Views: 426

Answers (1)

Shay Erlichmen
Shay Erlichmen

Reputation: 31928

I think that you should delete the blobs in a task instead of inline with the entity itself.
You can create a transaction that will queue the task and delete the entity at once.

Deleting the blobs in a task will give you the benefit of retries in case of an error and it will no delay the delete operation in case you have a lot of blobs.

Upvotes: 1

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