prevent overwriting based on global secondary index

[edupre]

Hello,
My understanding is that {overwrite : false} prevents overwriting only based on the partition key.

When I create an object with a generated partition key (uuid), how can I prevent overwriting based on another attribute (for instance, an email address) ? Note that this attribute could be a global secondary index.

Thanks!

[clarkie]

Unfortunately this isn't realistic with DynamoDB. The best approach is to use the email address as the hashkey. This is the only way to guarantee uniqueness with dynamodb.

[clarkie]

For more information on conditional writes please see #32