DataStore codegen wrong message for union types

[drochetti]

Describe the bug
When a union type is defined in the schema.graphql, an attempt to generate DataStore models fails with the following message:

Unknown type SearchResult for field items. Did you forget to add the @model directive

Amplify CLI Version
4.21.1

To Reproduce

• Create a schema with a union type.
• run amplify codegen models

Sample schema:

union SearchResult = Contact | User | Entity
type SearchableConnection {
  items: [SearchResult]
  nextToken: String
  total: Int
}

Expected behavior
A clear message stating that union types are not supported in DataStore.

Screenshots
N/A.

Desktop (please complete the following information):

• OS: MacOS 10.14.6
• Node Version: 12.8.0

Additional context
Reported originally by @lenarmazitov: aws-amplify/amplify-swift#544

[olivoil]

is there a plan to support union types?

would it be possible for datastore to ignore the declarations of union types instead of throwing an error? and have part of an API using union types without datastore, and still use datastore for things it supports?

[arealmaas]

Bump? Having the same issue here. Added an issue in the codegen repo #143

Would be nice to atleast be able to use the union types even though it's not supported for datastore

[josefaidt]

Hey yall 👋 thanks for raising this! I'll transfer to the codegen repo for better assistance

[ucheNkadiCode]

Ca we please have an update on this? I think this is a pretty necessary part of GraphQL. Data store should seriously support unions.

[AndresPope]

There is an update about this topic??

[github-actions]

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