What is the process for incorporating a unique Mongo expression into a JSON object?

I'm currently trying to figure out how to add a specific Mongo command to my JSON object. Normally, adding regular strings or objects is straightforward, but I'm struggling with this particular command:

$set : { "author" : req.body.name }

Simply assigning it like myJsonObject.author = "$set..." isn't working as expected.

If anyone can assist with this issue, I'd greatly appreciate it. Also, if you have any insights on updating multiple items in a MongoDB update using a JSON object, please share your knowledge. Currently, I'm only able to update the last item in the object, which is causing some trouble for me.

Here's an example of my JSON object:

updateItem = {
    $set : { "name" : "Squid bonobo" },
    $set : { "author" : "Mardy Bum" }
};

and here's the code snippet that performs the update:

updateData.update(searchItem, updateItem, false, true, function(err, results) {
        console.log(results);
        db.close();
    });

If you have experience or solutions to these issues, your help would be invaluable. Thanks in advance!

Cameron

Answer №1

The structure for your JSON needs to follow this format:

itemUpdate = {
    $set : { "name":"Elephant flamingo","author":"Arctic Monkeys"}
}

Although Javascript Objects allow duplicate keys/properties, their values will be overwritten with the latest assigned value for the key, in any order.

In this scenario, the key $set has been assigned twice to the same object referenced by the variable itemUpdate. Therefore, only one value, which is the last encountered, will be associated with the key. The value that takes precedence in this case is:

$set:{ "author":"Arctic Monkeys" }

As a result, the final query executed will appear as follows:

itemUpdate = {
    $set : { "author" : "Arctic Monkeys" }
};

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