Dynamo increment for ruby

dynamo_increment.rb

client = Aws::DynamoDB::Client.new(
    region: Rails.application.secrets.dynamo_region,
    credentials: Aws::Credentials.new(key,secret)
)


params = {
    table_name: 'table_name',
    key:{
        'id': self.object_id
    },
    update_expression: 'set comments = comments + :val',
    expression_attribute_values:{
        ':val': 1
    },
    return_values: 'UPDATED_NEW'
}

client.update_item(params)