IDs in Meteor Collections: Choose between Random.id() or Meteor.Collection.ObjectID()

When I add files to my Meteor collections, they are given a unique _id in the form of Random.id:

Random.id();
// "wjQyQ6sGjzvNMDLiJ"

If I add files directly from MongoDB to those same collections, they receive an _id represented as Meteor.Collection.ObjectID.

new Meteor.Collection.ObjectID();
// LocalCollection._ObjectID {_str: "b105582bc495617542af18e9"…}

I am curious why my application uses Random.id. Could this be a setting passed down from previous versions?

The Meteor versions that were active when I developed my app:

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="660b0312030914265748574852">[email protected]</a>
<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="305d5544555f421d405c5144565f425d70011e021e01">[email protected]</a>
javascriptmongodbmeteor

Answer №1

When you programmatically create a Meteor collection from your application, you can choose the type of ID generation method used for new documents in that collection. If no option is specified, a random string generation function is used by default. For more information, refer to the Meteor documentation. Without specifying an option, Meteor relies on the random package to generate these IDs. By using the link provided, you will see that the first item listed is a function for generating random IDs, which is where the Random.id() function comes into play. When accessing MongoDB directly, this flow of logic is bypassed, resulting in MongoDB-type ID strings.

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