Ligthweight Utils for MongoDB

This is a very lightweigth utilities package for mongodb. The motivation behind this package is making some repetitive tasks more easly.

CollectionHelper

CollectionHelper expose api for CRUD operations on MongoDB collection which include validation before save operations using ValidationHelper

findOne: Wraps mongodb collection findOne method

   try{ 
    import Helpers from "@corluk/mongo-utils" 
    const client = new MongoClient()
    const collection = client.db().collection("test")
    const collectionHelper= Helpers.CollectionHelper(collection)
    const obj = collectionHelper.findOne({key:"value"}) 
    console.log("object" , obj)
    }catch (err){
        console.log("error", error.message)
    }
    // returns 
    // {key:"value"}

find Wraps mongodb collection find method

**

usage:

  import Helpers from "@corluk/mongo-utils" 
    
     
    try{ 
        const client = new MongoClient()
        const collection = client.db().collection("test")
        const collectionHelper= Helpers.CollectionHelper(collection)
        const obj = collectionHelper.save({key:"value"}) 
        console.log("object" , obj) 
   
    // retuns 
    // { _id : "61a2934c670ef7e01b8b392f", key:"value"}

ValidationHelper

ValidationHelper expose simple api for simple required field check if not validates throws an Error.

validate: Validates input object, throws error if validation

onValidate: Add custom function may throw error on validate.

addKey: Adds keys to check when validate called.

removeKey:
Removes key inside validation object.If you dont want to create new instance add and remove some keys in runtime.

usage:

import Helpers from "@corluk/mongodb-utils" 
const validationHelper = Helpers.ValidationHelper(["key1","key2"]) 
validationHelper.removeKey("key2")
const obj = {key1: "a" } 
validationHelper.validate(obj) // pass because we removed *key2* from 

validationHelper.addKey("key2") 
validateHelper.validate(obj) // throws error key2 added to required
fields 

validationHelper.onValidate((obj)=>{
    if(obj.items.length < 1){
        throw new Error("items length less than one")
    }
}) 
const obj = {items: []} 
validationHelper.validate(obj) // throws error 
keylist 

check test/validation.spec.js more usage examples

PaginationHelper

Enables pagination to FindCursor object. Supports: - costum collation - custom sort - pagination cycle PaginationHelper takes cursor as parameter and paginate the cursor result and returns both count of items and items array setSort Adds sort parameter as shown in https://docs.mongodb.com/drivers/node/current/fundamentals/crud/read-operations/sort/

setCollation Adds collation parameter as shown in https://docs.mongodb.com/manual/reference/method/cursor.collation/

paginate Paginates cursor for given current page and perpage arguments. Cycles back and forth.

params

• page {number}
• perPage {number}
• mode {"lineer:default"| {"cycle"}}

usage

import Helpers from "@corluk/mongodb-utils"
import {MongoClient} from "mongodb"
const client = new MongoClient() 

const collectionHelper = Helpers.CollectionHelper(client.db().collection("test")) 

for(let i = 0 ; i != 100 ; i++){
    await  collectionHelper.save({value:i})
}
const paginationHelper = Helpers.PaginationHelper(cursor)
paginationHelper.setSort({value:1})
paginationHelper.setCollation({locale:"en_US", numeric})
const cursor = await collectionHelper.find({})

const page = paginationHelper.paginate(1,10) 
// returns {count:100,items:[{value:1},{value:2}...{value:10}]}