Add or remove an entry from a List type attribute in a DynamoDB table item

Question

I have a very simple class, with a string type primary key and List type attributes. I want to write an API for adding and removing an item from the attribute list, and savi

Answer 1

I just read the UpdateItem API thoroughly which talks about deleting set type attributes:

DELETE - Removes the attribute and its value, if no value is specified for DELETE. The data type of the specified value must match the existing value's data type.If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.