CODEWITHSUNDEEP
mongodb
Mathix420
Mathix420

Reputation: 1277

Put a prefix for ObjectID for MongoDB _id field

I'm trying to put a prefix before the auto generated _id, to identify from which collection came an id, but I still want to use the mongo unique id generator.

So I can know that this id model_5e1a51821c9d44000089e3e0 came from the Model collection.

Is there a solution for that without messing with random string ?

Edit

The _id need to be string castable, since I use it as id in a graphQL object. I need to differentiate ids because I use an union in my schema and resolver need to know in which table to find the data.

Upvotes: 2

Views: 3199

Answers (2)

prasad_
prasad_

Reputation: 14287

The _id can be generated within an application with the constructor ObjectId(). If you want to add a prefix for the generated field, you can use an embedded document as a field for the _id, like this:

_id: {
    idPrefix: "Model",
    _id: ObjectId("5e1bd112b7f18a490a4bafb5")
}

Other way of identifying if a document is from another collection is use a separate boolean field:

{
  _id: ObjectId("5e1bd112b7f18a490a4bafb5"),
  isFromModel: <boolean true or false>,
  ...
}

Upvotes: 2

user12602844
user12602844

Reputation:

There are some options available to do this, I'm just trying to tell you the way how would I do if I need this.

Step 1: You can generate the document and it will return you ObjectId (_id) .

Step 2: Take that value and prefix it with model like this.

let _id=5e1a51821c9d44000089e3e0;let new_idValue="model_"+_id;

Step3: Now update your document by _id and push new value in place of if as

this.db.document.findByIdAndUpdate(_id,{$set:{{_id:new_idValue}})

This is what you can do. If you find some best solution than mine, let me know as well. I will highly appreciate.

Upvotes: 0

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