Sorting by multiple fields in MongoDB

I am interested in ordering a collection based on multiple keys, such as sorting by age in descending order and score in ascending order:

db.collection.find().sort( { age: -1, score: 1 } );

While this approach works well, I want to ensure that the age key is always prioritized over the score key.

In JavaScript, the order of object keys may not be guaranteed, as discussed here.

The documentation from MongoDb regarding sorting is somewhat unclear.

Therefore, I'm seeking clarification on whether the method demonstrated is reliable in terms of maintaining the specified order of arguments.

Thank you.

javascriptmongodb

Answer №1

If your JavaScript implementation maintains the order of keys in objects, then the syntax you are using will work. However, it is important to verify this for yourself.

When using the Nodejs official driver, there is an alternative method that works well with an Array:

db.collection.find().sort([[age, -1], [score, 1]]);

Similar approaches may be available for drivers in other programming languages.

Answer №2

If you take a look at the aggregation documentation, it delves deeper into the topic and states:

db.users.aggregate(
    { $sort : { age : -1, posts: 1 } }
);

This action organizes the records in the users collection by descending order based on the age field and then by ascending order using the value in the posts field.

From this explanation, it seems that the .sort() method operates in a similar manner.

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