Placing a Fresh Item into a Designated Slot within an Array

Imagine having a MongoDB collection that consists of an array of objects being retrieved from an Angular Resource.

[{_id: "565ee3582b8981f015494cef", button: "", reference: "", text: "", title: "", …}, 
 {_id: "565ee3582b8981f015494cf0", button: "", reference: "", text: "", title: "", …}]

The task at hand involves enabling the user to add an object to any specific index within the array and then saving it into MongoDB using Mongoose.

var object = {
    button: "",
    image: {},
    reference: "",
    text: "",
    title: "",
};

I know how to add the object to the end of the array, but my question is: How can I determine the index for insertion?

My current approach involves initially creating the object:

Slide.create(object, function(result) {
    console.log(result);
});

Then, I'm contemplating using an update method to specify the position in the array:

javascriptangularjsmongodbmongoosemongodb-query

Answer №1

Imagine you have this particular document stored in your collection

{
        "_id" : ObjectId("565eed81abab97411fbe32fc"),
        "docs" : [
                {
                        "_id" : "565ee3582b8981f015494cef",
                        "button" : "",
                        "reference" : "",
                        "text" : "",
                        "title" : ""
                },
                {
                        "_id" : "565ee3582b8981f015494cf0",
                        "button" : "",
                        "reference" : "",
                        "text" : "",
                        "title" : ""
                }
        ]
}

In order to insert elements using the $position operator at a specific location within the array, as stated in the documentation:

Incorporate the $position modifier along with the $each modifier.

Example

var object = {
    button: "",
    image: {},
    reference: "",
    text: "",
    title: "",
};

db.slide.update({/*filter*/}, 
    { '$push': { 'docs': { '$each': [object], '$position': 1 } }
})

The updated document will be structured like this:

{
        "_id" : ObjectId("565eed81abab97411fbe32fc"),
        "docs" : [
                {
                        "_id" : "565ee3582b8981f015494cef",
                        "button" : "",
                        "reference" : "",
                        "text" : "",
                        "title" : ""
                },
                {
                        "button" : "",
                        "image" : {

                        },
                        "reference" : "",
                        "text" : "",
                        "title" : ""
                },
                {
                        "_id" : "565ee3582b8981f015494cf0",
                        "button" : "",
                        "reference" : "",
                        "text" : "",
                        "title" : ""
                }
        ]
}

Answer №2

let newObj = {
    key1: "",
    key2: {},
    key3: "",
    key4: "",
    key5: "",
};

array.splice(2, 0, newObj);

This operation will insert the newObj into the array at index 2, making it the third element in the array.

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