MongoDB: Match multiple array elements

Question

I have a collection with next data:

db.MyCollection.insert({ 
        id: 1, 
        Location: [ 1, 1 ],
        Properties: [ { Type: 1, Value: \"a\" }, {          


        

Answer 1

In a case like this where you want the docs that include a specific set of array elements, you can use the $all operator:

db.MyCollection.find(
{ 
    Location: { "$within": { "$center": [ [1, 1], 5 ] } },
    Properties: {
        $all: [
            {$elemMatch: { Type: 1, Value: "a" }},
            {$elemMatch: { Type: 2, Value: "b" }}
        ]
    }
})

To do it without the $all operator you could use:

db.MyCollection.find(
{ 
    Location: { "$within": { "$center": [ [1, 1], 5 ] } },
    $and: [
        { Properties: {
            $elemMatch: { Type: 1, Value: "a" }
        }},
        { Properties: {
            $elemMatch: { Type: 2, Value: "b" }
        }}
    ]
})