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I'm using node with typescript, and mongoose for database.

I have this code that takes user model from database (using mongoose) by user id, then takes the user roles attribute. The roles attribute contains array of object. Inside each object (roles) contains _id

// Check User Roles
      const user = await this.userModel.findById(req.identitas.user._id)
      const userRoles: Array<string> = []
      for (let index in user.roles) {
        userRoles.push((user.roles[index]._id))
      }

When i try to check the type of what's pushed to userRoles

console.log(typeof(userRoles[0]))

It says that it has object type variable.

I then decided to try

userRoles.push({ dummy: "dummy" })

and it wouldn't let me do that. So I know for sure that the type declaration in

const userRoles: Array<sring> = []

is working properly. But, at the same time, it isn't. When I try to push _id to userRoles, it still somehow allows me to do that.

This is a problem because I'm using this userRoles array of string to compare it with another string value, using

userRoles.includes("some-string-here")

Why and how did this thing could happen?

*This is what user variable contains:

{
  roles: [
    {
      _id: 5f93fdc**********36,
      name: 'Karyawan Cabang Neutron',
      ...
      __v: 2,
      policies: [],
      organization: 5f8fe9a62*****000082e3fef
    }
  ],
  units: [
    {
      _id: 5fc1f9******00081b2897,
      name: 'Neutron Yogyakarta 2',
      code: '102',
      organization: 5f8fe****42a2000kj13fef,
      createdAt: 2020-11-28T07:18:09.628Z,
      updatedAt: 2020-11-28T07:18:09.628Z,
      __v: 0
    }
  ],
  organizations: [
    {
      _id: 5f8c6b*****b75jg008d4a156,
      ...
      __v: 34,
      code: 'NEO',
      logo: [Object],
      content: [Array],
      object: [Object],
      config: [Array]
    }
  ],
  _id: 5fdad1a25e9f78****c42,
  email: 'email@example.com',
  username: 'EmiliaBestGirl',
  ...
  isEmailVerified: true,
  identities: [],
  createdAt: 2020-12-17T03:33:54.484Z,
  updatedAt: 2020-12-22T08:12:24.019Z,
  __v: 3,
  ...
}
Dani Ihza Farrosi
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  • Without a [mcve] suitable for dropping into a standalone IDE it's hard to tell what could be going on. What's the type of `user.roles`? – jcalz Dec 23 '20 at 03:41
  • @jcalz In console.log(typeof(user.roles)) it gave me `object` type. Maybe I'll edit the question and add what `user` is containing – Dani Ihza Farrosi Dec 23 '20 at 03:59
  • I found [this](https://stackoverflow.com/questions/27896979/difference-between-storing-an-objectid-and-its-string-form-in-mongodb) regarding the ObjectID in MongoDB. From what I read there, string and ObjectId is different from each other.. So this Array should not contain any other type than string – Dani Ihza Farrosi Dec 23 '20 at 04:18

0 Answers0