Error: DynamoDB string set cannot be empty

Rafal Wilinski

Answered by Rafal Wilinski

What's Causing This Error

This error occurs when trying to insert or update an item in a DynamoDB table that has a String Set attribute with an empty value. DynamoDB String Sets are a data type used to represent multiple strings, and they cannot be empty.

Solution: Here's How To Resolve It

To solve this error, you should ensure that the String Set attribute is not empty before inserting or updating the item in the DynamoDB table.

You can do this by adding at least one string to the set or removing the attribute if it's unnecessary.

Alternatively, suppose the attribute is optional, and an empty value is expected. In that case, you can validate the input on the client side to check if the attribute is empty and remove it from the item before sending the request.

You can also use the put_item() or update_item() functions provided by the AWS SDK for Python (Boto3) to insert or update items in the table, respectively, which will automatically handle the validation of the String Set attribute.

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