public <V> DynamoDBMapperFieldModel<T,V> field(String attributeName) {
        return this.model.field(attributeName);
    }
Gets the field model for a given attribute.
@param <V> The field model's value type.
@param attributeName The attribute name.
@return The field model.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/DynamoDBTableMapper.java