"Implementing self-referencing mongoose models in Typescript: A step-by-step guide

I have a model:

const message = new mongoose.Schema({
  id: { type: ObjectId, required: true },
  text: { type: String },
  replies: [message]
});

Looking to create a document structure like this:

{
  "id": 1,
  "text": "Main Message",
  "replies": [
    {
      "id": 11,
      "text": "Reply One",
      "replies": [
        {
          "id": 111,
          "text": "Second Level Reply",
          "replies": []
        },
        {
          "id": 112,
          "text": "Another Second Level Reply",
          "replies": []
        }
      ]
    }
  ]
}

Based on the solution provided in this link

You can resolve it by utilizing this as a reference to the model.

  const message = new mongoose.Schema({
    id: { type: ObjectId, required: true },
    comment: { type: String },
-   replies: [comment]
+   replies: [this]
  });

However, when attempting this with TypeScript, an error may occur:

'this' implicitly has type 'any' because it does not have a type annotation.

Is there a recommended method to model self-references using mongoose in TypeScript?

typescriptmongoosemongoose-schema

Answer №1

If you want to achieve this in a more efficient manner, consider breaking it down into two separate steps using the add method:

const userSchema = new mongoose.Schema({
  name: String,
});

userSchema.add({
 posts: [userSchema]
});

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