Objection js update with increments +1

Question

How i can update value in database using objection ? My SQL query works perfect.

UPDATE "freePlace"
SET number = number-1
WHERE   date >= '2017-10-20'   AND date <= '2017-10-30' AND "idObject" = '1'

My objection code:

FreePlace.query().patch({number:number+1}).where('date', '>=', startDate)
  .andWhere('date', '<=', endDate)
  .andWhere('idParking', '=', parkingId)

Problem is in patch({number:number+1}) how i need do this ?

Answer 1

Looks like you need to use ref(). The code as you have it won't know where to get the value of "number+1".

How about this?

FreePlace.query().patch({number:ref('number')+1})
  .where('date', '>=', startDate)
  .andWhere('date', '<=', endDate)
  .andWhere('idParking', '=', parkingId)

See this example from objection.js docs:

Person
  .query()
  .patch({
    age: Person.query().avg('age'),
    firstName: Person.raw("'Jenni' || 'fer'"),
    oldLastName: ref('lastName')
  });

Answer 2

You can use the increment/decrement methods:

FreePlace.query()
  .increment('number', 1)
  .where('date', '>=', startDate)
  .andWhere('date', '<=', endDate)
  .andWhere('idParking', '=', parkingId)

If you need to update something else in the same query, you can use raw

FreePlace.query()
  .patch({
    number: raw('number + 1'),
    somethingElse: 42
  })
  .where('date', '>=', startDate)
  .andWhere('date', '<=', endDate)
  .andWhere('idParking', '=', parkingId)

raw comes from const { raw } = require('objection')