how can I filter an array in MongoDB using a specific condition

This is an example of my MongoDB object:

{
    "_id": ObjectId("asdklfjasdlkfjal"),
    "geometry": {
        "type": "Point",
        "coordinates": [
            -26.62375,
            152.86114
        ]
    }
},
{
    "_id": ObjectId("asdklfjasdlkfjal2"),
    "geometry": {
        "type": "Point",
        "coordinates": [
            -28.62375,
            123.86114
        ]
    }
}

Although I've consulted the documentation, I couldn't find a way to query only the first element of the array.

I attempted this line in MongoHub: {"geometry.coordinates": {$and: [{$lt: -30, $gt: 151}, {$lt: -35, $gt: 151}]} but received an error message saying "invalid operator: $and".

For instance, I wish to retrieve the objects with a value greater than -27 as the first element in the array. This means only the first example object should be retrieved regardless of the second element's value in the array (or vice versa).

I also came across this similar question from 3 years ago and I'm wondering if there have been improvements or better solutions since then.

Thank you for taking the time to consider my question.

Answer №1

The query method mentioned in the referenced question may not directly address your specific needs. Instead of fixed coordinates like longitude and latitude, consider using "dot notation":

 db.collection.find({ "geometry.coordinates.0": { "$gt": -27 } })

In this syntax, 0 represents the longitude position, while 1 would refer to the latitude value.

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