Select specific fields from database

Question

I just want to know that is it possible to select specific fields using waterline, orientdb query is given below.

e.g. 
select phone from user

I want to select phone from user vertices by using this query

userModel.find(phone)
.then(function(phonelist){ 
  if(!phonelist) 
     console.log('msg: RECORD_NOT_FOUND'); 
  else 
     console.log(phonelist);
.catch(function(err){ console.log('err: 'err'); });

Jabalpur

Answer 1

Yes, it's possible, you just need to add select to your search criteria, for example (assuming you are searching for a records with id 1):

userModel.find({ select: ['phone'], id: 1 })

or alternatively:

userModel.find({ select: ['phone'], where: { id: 1 } })

or if you want all records, you don't need to supply criteria:

userModel.find({ select: ['phone'] })

This doesn't seem to be documented anywhere but it should. In version 0.11 it will also possible to define select by doing model.pick('name', 'age'): https://github.com/balderdashy/waterline/pull/952

Lurlinelusa

That does not work for me in Waterline 0.10.21, I get all the fields without any selection :( - I hope 0.11 is released soon! – Falla

@FranDios, are you using sails-mongo? If so there was a bug in it that was only fixed and released 8 days ago (v0.11.3). – Orientalism

Yes, I do use sails-mongo. Thanks for the info, will check it :) – Falla

I've the same issue, updated sails-mongo to 0.11.3 but unfortunately the url: localhost:1337/modelName?select=['date'] still returns all the fields. – Dacy

select works for me on sails v 0.12.13, however, how can i prevent id from tagging along with the response? – Mazel

Answer 2

Source and more detail -https://mcmap.net/q/827415/-specify-returned-fields-in-node-js-waterline

Yes, it's possible but not with select as it's still in development. But there is a way to achieve it using fields.

Model.find({ id: id }, {
  fields: {
    name: 1,
    phoneNumber: 1
  }
}).limit(1).exec(function(...) {};

This won't work with findOne.

Fini

Answer 3

In Sails version 1 they have added provision for sending query as well as projection to the find()/findOne() methods. You can simply do: Model.find({where: {id: id}, select: ['name', 'phoneNumber']})

Find reference here: https://sailsjs.com/documentation/reference/waterline-orm/models/find#?using-projection

Gentry

Answer 4

You can use the .select() method

let phones = await userModel.find().select(['phone']);

The opposite of .select() is .omit()

Lody

This is just for sails 1.0, right? – Gaiser

@Gaiser yes, that's right. – Lody