Allow to set our proper ID when using DataStore and generated models

It would be great to allow us to manage IDs ourself. I see already two case where built-in IDs management is not efficient.

UserID from Cognito (sub) How many devs wanted to save a User object with the sub as ID? But currently we can’t and need to save it as separate property with an index.

type User {
  id: ID! # would be great sub from Cognito
  address: String
}

Support of Union?

type Image {
  id: ID!
  name: String!
  width: Int!
  height: Int!
  url: String!
}

type Video {
  id: ID!
  name: String!
  lang: Lang!
  resolutions: [Resolution!]!
  url: String!
}

union Media = Image | Video

type Product {
  id: ID!
  name: String!
  description: Media! @connection
}

By having the typename as prefix of the ID we could determine where to fetch the resource. This must be also with a Improvement of @connection amplify-cli#5129.

Shorter IDs? (more personal choice) Personally I like to have short and self descriptive IDs (using uniqid node package) like:

• img-XXXXX
• vid-YYYYY
• pdt-ZZZZZ

How can it be made? I suppose there we can also pass the typename and maybe get from the config a custom uuid factory. https://github.com/aws-amplify/amplify-js/blob/00d5e1773766dad5a1c04b70e2d6d72a42268796/packages/datastore/src/storage/adapter/AsyncStorageDatabase.ts#L32-L38

[nitemarket]

Any updates here? would be great to save a predefined ID for the model.

[thiskevinwang]

Docs on best practices/common patterns for Cognito User Pool “Users” <> Amplify DataStore “Users” would be great as well.

Currently, the field is a bit hazy in this topic.

• How do you specify a unique user-specified username? Do you query the DataStore first?
• (Reiterating the original ask) How/can you pass a cognito-sub as the id for a custom User DataStore model? Currently, it’s readonly and you cannot update it.
• etc.