Calculate a value within a MongoDB field

Question

Calculate a value within a MongoDB field

Hello everyone, I have a document in my collection that looks like this: { Player_Name: Sandeep Nair Player_TotalWeightedPoints: 80 Player_Rank: 23 }

I have around 200 similar documents in my collection. The Player_Rank is determined by the total Weighted points, sorted in descending order. The player with the highest weighted points has rank 1, and so on. I have 2 specific use cases:

I need to show the player's rank when they log into the web application.
I need to update the rank based on match scores every time a match occurs.

How can I calculate this Rank field in Mongo DB? Any insights would be greatly appreciated.

javascript mongodb

Answer 1

Answer №1

Your inquiry may require further clarification, but I do have a few recommendations for you.

For scenario 1:

Consider assigning a unique ID to each player to easily access their related information.

Let's assume Player A has logged in with UID: 123, you can use the following code:

var data  = db.player.find({}, {uid: 123});
var rank = data.Player_Rank;

The player's rank will be stored in the rank variable for use throughout the page.

For scenario 2:

Once points are input, sort the list based on points.

db.player.find().sort({Player_TotalWeightedPoints: -1})

After sorting the list, you can assign player ranks ranging from 1 to 200 like this:

db.players.aggregate([{
    $project: {
        "Player_Rank": { $range: [1, 200] }
    }
}])

These are my suggestions based on the information provided in your question.

Answer 2

Your inquiry may require further clarification, but I do have a few recommendations for you.

For scenario 1:

Consider assigning a unique ID to each player to easily access their related information.

Let's assume Player A has logged in with UID: 123, you can use the following code:

var data  = db.player.find({}, {uid: 123});
var rank = data.Player_Rank;

The player's rank will be stored in the rank variable for use throughout the page.

For scenario 2:

Once points are input, sort the list based on points.

db.player.find().sort({Player_TotalWeightedPoints: -1})

After sorting the list, you can assign player ranks ranging from 1 to 200 like this:

db.players.aggregate([{
    $project: {
        "Player_Rank": { $range: [1, 200] }
    }
}])

These are my suggestions based on the information provided in your question.

Calculate a value within a MongoDB field

Answer №1

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