Why doesn't find work in mongoose?

Question

JavaScript

Before that I didn’t work with mongoose, I created a model, added a method, how can I find something in the collection in this method? Now the error is this.find is not a
function

interface IUser extends mongoose.Document{
  isValidUser: () => Promise<boolean>;
}

const userSchema = new Schema({
  id: String,
  login: String,
  password: String,
  regDate: {
    type: Date,
    default: Date.now()
  }
});

userSchema.methods.isValidUser = async (): Promise<boolean> => {
  const {login, password} = this;
  const foundUser = await this.find({login, password});
  return !!foundUser;
};

export const User = mongoose.model<IUser>('user', userSchema);

Answer 1

The problem is in the arrow function - you need to use full-fledged functions
https://mongoosejs.com/docs/guide.html#methods
Do not declare methods using ES6 arrow functions (=>). Arrow functions explicitly prevent binding this, so your method will not have access to the document and the above examples will not work.