lodash-id

lodash-id makes it easy to manipulate id-based resources with lodash or lowdb

• getById
• insert
• upsert
• updateById
• updateWhere
• replaceById
• removeById
• removeWhere
• save
• load
• createId

Install

Node

$ npm install lodash lodash-id

Note lodash-id is also compatible with underscore

Usage example

const _  = require('lodash')

_.mixin(require('lodash-id'))

Create an empty database object

const db = {
  posts: []
}

Create a post

const newPost = _.insert(db.posts, {title: 'foo'})

Display database console.log(db)

{
  posts: [
    {title: "foo", id: "5ca959c4-b5ab-4336-aa65-8a197b6dd9cb"}
  ]
}

Retrieve post using lodash-id get or underscore find method

const post = _.getById(db.posts, newPost.id)

const post = _.find(db.posts, function(post) {
  return post.title === 'foo'
})

Persist

_.save(db)

API

The following database object is used in API examples.

const db = {
  posts: [
    {id: 1, body: 'one', published: false},
    {id: 2, body: 'two', published: true}
  ],
  comments: [
    {id: 1, body: 'foo', postId: 1},
    {id: 2, body: 'bar', postId: 2}
  ]
}

getById(collection, id)

Finds and returns document by id or undefined.

const post = _.getById(db.posts, 1)

insert(collection, document)

Adds document to collection, sets an id and returns created document.

const post = _.insert(db.posts, {body: 'New post'})

If the document already has an id, and it is the same as an existing document in the collection, an error is thrown.

_.insert(db.posts, {id: 1, body: 'New post'})
_.insert(db.posts, {id: 1, title: 'New title'}) // Throws an error

upsert(collection, document)

Adds document to collection, sets an id and returns created document.

const post = _.upsert(db.posts, {body: 'New post'})

If the document already has an id, it will be used to insert or replace.

_.upsert(db.posts, {id: 1, body: 'New post'})
_.upsert(db.posts, {id: 1, title: 'New title'})
_.getById(db.posts, 1) // {id: 1, title: 'New title'}

updateById(collection, id, attrs)

Finds document by id, copies properties to it and returns updated document or undefined.

const post = _.updateById(db.posts, 1, {body: 'Updated body'})

updateWhere(collection, whereAttrs, attrs)

Finds documents using _.where, updates documents and returns updated documents or an empty array.

// Publish all unpublished posts
const posts = _.updateWhere(db.posts, {published: false}, {published: true})

replaceById(collection, id, attrs)

Finds document by id, replaces properties and returns document or undefined.

const post = _.replaceById(db.posts, 1, {foo: 'bar'})

removeById(collection, id)

Removes document from collection and returns it or undefined.

const comment = _.removeById(db.comments, 1)

removeWhere(collection, whereAttrs)

Removes documents from collection using _.where and returns removed documents or an empty array.

const comments = _.removeWhere(db.comments, {postId: 1})

save(db, [destination])

Persists database using localStorage or filesystem. If no destination is specified it will save to db or ./db.json.

_.save(db)
_.save(db, '/some/path/db.json')

load([source])

Loads database from localStorage or filesystem. If no source is specified it will load from db or ./db.json.

const db = _.load()
const db = _.load('/some/path/db.json')

id

Overwrite it if you want to use another id property.

_.id = '_id'

createId(collectionName, doc)

Called by lodash-id when a document is inserted. Overwrite it if you want to change id generation algorithm.

_.createId = function(collectionName, doc) {
  return collectionName + '-' + doc.name + '-' + _.random(1, 9999)
}

FAQ

How to reduce file size?

With Lodash, you can create custom builds and include just what you need.

$ npm install -g lodash-cli
$ lodash include=find,forEach,indexOf,filter,has

For more build options, see http://lodash.com/custom-builds.

Changelog

See details changes for each version in the release notes.

License

lodash-id is released under the MIT License.