使用带有 update_item 的 boto3 资源在 dynamo DB 中添加新列

Question

I need to update a row in Dynomodb while doing so need to include a new column which is already not there.

resp = table.update_item(
            Key={
                'Pkey': 'key1',
                'Skey': 'skwy2'
            },
            UpdateExpression='ADD dateModified = :input2, SET IsActive = :input1',
            ExpressionAttributeValues={
                ':input1': False,
                ':input2' :  datetime.datetime.now(timezone.utc)
            },
            ReturnValues="UPDATED_NEW"
        )

now I need to update IsActive field to false and insert new dateModified value to that .

getting error as Invalid UpdateExpression: Syntax error; token: "=", near: "dateModified = :input2"

Answer 1

you can see in https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html#Expressions.UpdateExpressions.ADD that for the ADD operation you don't use =

so the correct expression should be ADD dateModified :input2 SET IsActive = :input1