DTO (Data Transfer Objects)

Overview

This library was created to solve the problem of taking a data model from a datasource and needing to remove, add, merge, or translate the data model to a similar or completely different object.

There are similar libraries in other languages (DataMapper, DTO(C#), etc). I could never find a solution that allowed me to quickly and easily utilize a couple of different approaches: projection, translation, and merging.

Getting Started

Projection

There are two simple ways to project (like a SQL SELECT statement) or simplify an object. I found myself deleting the properties on the object, or using libraries such as lodash to restrict the output. I decided to use Lazy.js for performance reasons.

Only

Given an array of property names, the resulting object will only contain the supplied properties.

Example

let Dto = require('dto');
let model = { name: { first: 'Simran', last: 'Bhalode'}, age: 21, gender: 'Female'};

let result = Dto.take.only(model, ['age', 'gender']);
// result = { age: 21, gender: 'Female' }

Without

Given an array of property names, the resulting object will remove any properties supplied.

Example

let Dto = require('dto');
let model = { name: { first: 'Simran', last: 'Bhalode'}, age: 21, gender: 'Female'};

let result = Dto.take.without(model, ['name']);
// result = { age: 21, gender: 'Female' }