mongo insert into array at top without duplicates

Question

I am trying to update an array of ids with an additional item but I require the following: 1. if it exists then obviously it's not duplicate 2. if a new item is added it done on top of the array

Schedule.update(
  { date: "10/4/2018" },
  { $addToSet: { games: <id> }},
  { upsert: true },
function(err, update){

})

Thanks,

Kris

dnickless · Accepted Answer · 2018-10-04 21:15:08Z

1

You'd want to use the $position modifier for that:

Schedule.update(
  { date: "10/4/2018", games: { $nin: <id> } }, // exclude documents that already contain the <id> value
  { 
    $push: {
      games: {
        $each: [ <id> ],
        $position: 0 // push to first position
      }
    }
  },
  { upsert: true },
function(err, update){

})

answered Oct 4, 2018 at 21:15

dnickless

10.9k1 gold badge22 silver badges35 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

mongo insert into array at top without duplicates

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related