Using updateOne with Arrays in Mongoose with NodeJS

Question

Im working on an API for a custom game and i need to update specific fields in an array in my Database Entry. How do i do that without adding a new thing to the array, instead just updating for example the content of entry 5 in the array

Xanik · Accepted Answer · 2022-05-15 17:00:45Z

1

Hello I'm not sure the name of your schema so I'm assuming its called Game so here is an example for how to update an index in an array assuming its the board array field you're trying to update. Also reference here for more details on updating an array field by it's index:

var fieldPosition = "board." + req.params.field

await Game.updateOne({
  _id: 1
}, [{
    $set: {
      tempBoard: fieldPosition
    }
  },
  {
    $set: {
      "$tempBoard": session.turn
    }
  },
  {
    $unset: ["tempBoard"]
  }
])

edited May 15, 2022 at 17:00

answered May 15, 2022 at 8:15

Xanik

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5 Comments

DNAScanner Over a year ago

Sorry, that i didnt give enough information. This basically works, but how do i say that it changes the content of board.req.params.field (basically with variable)? I tried this, but it doesnt start anymore (Unexpected token '+')

js await sessionCollection.updateOne({sessionId: session.sessionId}, {$set: {"board."+req.params.field: session.turn}});

Xanik Over a year ago

while not create a variable and try it like: var board = "board" + req.params.field then you can use it as: sessionCollection.updateOne({sessionId: session.sessionId}, {$set: {board: session.turn}});

DNAScanner Over a year ago

I've tried this, but it doesnt update

js var fieldPosition = "board." + req.params.field; var setField = await sessionCollection.updateOne({sessionId: session.sessionId}, {$set: {fieldPosition: session.turn}});

Xanik Over a year ago

I updated the solution, try that

DNAScanner Over a year ago

Gives me error: pastebin.com/iKLTukXm

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