Is there a way to transform a string property into a custom type in a TypeScript array?

Question

Is there a way to transform a string property into a custom type in a TypeScript array?

I am faced with a situation where I have an interface that is extending a MongoDB document, along with some sample data that is also extending that interface. Below is an outline of the interface:

export default interface IModel extends Document {
_id: ObjectId;
name: string;
data: string;
}

The sample data conforms to this interface structure. The _id field looks like a string of numbers and letters. However, I encounter an error when assigning a value to the sample data in the _id fields because TypeScript interprets it as a string, whereas the type should be ObjectId. So, my question is, how can I convert the value of the id to be of type ObjectId?

This is what I have attempted so far:

export const ModelSampleData: IModel = {
"_id": toObjectId(240nfkfn38943),
"name": "model",
"data": "modelstuffetc"
}

I would greatly appreciate any guidance on this matter!

javascript arrays typescript mongodb interface

Answer 1

Answer №1

As mentioned in this resource, converting a string type to objectId can be done as follows:

export const ModelSampleData: IModel = {
  "_id": ObjectId("240nfkfn38943"),
  "name": "model",
  "data": "modelstuffetc"
}

Answer 2

As mentioned in this resource, converting a string type to objectId can be done as follows:

export const ModelSampleData: IModel = {
  "_id": ObjectId("240nfkfn38943"),
  "name": "model",
  "data": "modelstuffetc"
}

Answer 3

Answer №2

To resolve the issue, simply remove the empty string "". It seems like you attempted to copy a response and assign it to ModelSampleData, which is a JSON object, not a JavaScript object. If you wish to proceed, you should use JSON.parse. Both of the following samples should function correctly:

import { ObjectId } from 'mongodb';

export default interface IModel extends Document{
    _id: ObjectId ;
    name: string;
    data:string;
}

export const ModelSampleData1: IModel = JSON.parse(`{
    "_id": ObjectId(240nfkfn38943),
    "name": "model",
    "data": "modelstuffetc"
}`);

or

export const ModelSampleData: IModel = <IModel> {
    _id:  new ObjectId("240nfkfn38943"),
    name: "model",
    data: "modelstuffetc"
}

Answer 4

To resolve the issue, simply remove the empty string "". It seems like you attempted to copy a response and assign it to ModelSampleData, which is a JSON object, not a JavaScript object. If you wish to proceed, you should use JSON.parse. Both of the following samples should function correctly:

import { ObjectId } from 'mongodb';

export default interface IModel extends Document{
    _id: ObjectId ;
    name: string;
    data:string;
}

export const ModelSampleData1: IModel = JSON.parse(`{
    "_id": ObjectId(240nfkfn38943),
    "name": "model",
    "data": "modelstuffetc"
}`);

or

export const ModelSampleData: IModel = <IModel> {
    _id:  new ObjectId("240nfkfn38943"),
    name: "model",
    data: "modelstuffetc"
}

Is there a way to transform a string property into a custom type in a TypeScript array?

Answer №1

Answer №2

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