Selection Set returns single instance of option CustomType array

[MKlaeui]

Environment information

System:
  OS: Linux 6.6 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
  CPU: (8) x64 AMD Ryzen 3 7320C with Radeon Graphics
  Memory: 5.55 GB / 6.38 GB
  Shell: /bin/bash
Binaries:
  Node: 20.10.0 - ~/.config/nvm/versions/node/v20.10.0/bin/node
  Yarn: 1.22.21 - ~/.config/nvm/versions/node/v20.10.0/bin/yarn
  npm: 10.8.2 - ~/.config/nvm/versions/node/v20.10.0/bin/npm
  pnpm: undefined - undefined
NPM Packages:
  @aws-amplify/auth-construct: 1.2.2
  @aws-amplify/backend: 1.1.1
  @aws-amplify/backend-auth: 1.1.2
  @aws-amplify/backend-cli: 1.2.5
  @aws-amplify/backend-data: 1.1.1
  @aws-amplify/backend-deployer: 1.1.0
  @aws-amplify/backend-function: 1.3.2
  @aws-amplify/backend-output-schemas: 1.2.0
  @aws-amplify/backend-output-storage: 1.1.1
  @aws-amplify/backend-secret: 1.1.0
  @aws-amplify/backend-storage: 1.1.1
  @aws-amplify/cli-core: 1.1.2
  @aws-amplify/client-config: 1.2.1
  @aws-amplify/deployed-backend-client: 1.4.0
  @aws-amplify/form-generator: 1.0.1
  @aws-amplify/model-generator: 1.0.5
  @aws-amplify/platform-core: 1.0.6
  @aws-amplify/plugin-types: 1.2.1
  @aws-amplify/sandbox: 1.2.0
  @aws-amplify/schema-generator: 1.2.1
  aws-amplify: 6.5.3
  aws-cdk: 2.154.0
  aws-cdk-lib: 2.152.0
  typescript: 5.5.4
AWS environment variables:
  AWS_STS_REGIONAL_ENDPOINTS = regional
  AWS_NODEJS_CONNECTION_REUSE_ENABLED = 1
  AWS_SDK_LOAD_CONFIG = 1
No CDK environment variables

Data packages

├─┬ @aws-amplify/[email protected]
│ └─┬ @aws-amplify/[email protected]
│   └── @aws-amplify/[email protected]
└─┬ @aws-amplify/[email protected]
  └─┬ @aws-amplify/[email protected]
    └── @aws-amplify/[email protected]

Description

Selection Set of an optional array of custom types returns unexpected values. Taking the sample app listed here: [(https://issues/2368)] , if you replace the line verbiage: a.ref('Verbiage').required().array().required(), with verbiage: a.ref('Verbiage').array().required(), , then the result will be (Verbiage | null)[]. If you replace it with verbiage: a.ref('Verbiage').required().array(), then you get (Verbiage | null). I'm looking for something that returns (Verbiage[] | null). Is that not how it was meant to work?

[MKlaeui]

Just to elaborate on what I was expecting vs what is happening in each scenario:

• a.ref("Verbiage").required().array().required() returns Verbiage[], as expected
• a.ref("Verbiage").array().required() returns (Verbiage | null)[], as expected
• a.ref("Verbiage").required().array() returns Verbiage | null, I expected Verbiage[] | null
• a.ref("Verbiage").array() returns Verbiage | null, I expected (Verbiage | null)[] | null

[chrisbonifacio]

Hi @MKlaeui we were not able to reproduce the issue described. We tried each scenario listed but the type from Schema['Customer']['type']['verbiage'] seems to be correctly mapped to the schema definition.

It seems that your @aws-amplify/backend and @aws-amplify/backend-cli are up to date. Can you check if your @aws-amplify/data-schema is up to date?

[MKlaeui]

Thanks for looking into this. Data Schema is version 1.3.10

Just want to reiterate that my problem is specific to Selection Set. The Schema is as I expect (for verbiage: a.ref('Verbiage').required().array()):

const v: Schema['Customer']['type']['verbiage'] ; // v = verbiage[] | null | undefined

But using the Selection Set I get:

const { data: customerSet } = await client.models.Customer.list({
selectionSet: ['id', 'name', 'verbiage.', 'orders.',],
});

const abc = customerSet[0].verbiage; // abc = verbiage | null

[chrisbonifacio]

@MKlaeui thank you for reiterating that the issue was with selection set! I had forgotten that was specifically mentioned the first time I tried to reproduce this issue. Using selection set, I definitely see the problem and was able to reproduce consistently even on the latest versions of @aws-amplify/backend packages.

with this schema:

const schema = a.schema({
  AlphabetEnum: a.enum(["A", "B", "C", "D"]),
  Verbiage: a.customType({
    name: a.ref("AlphabetEnum").required(),
    paragraphs: a.string().required().array().required(),
  }),
  Customer: a
    .model({
      id: a.id().required(),
      name: a.string().required(),
      verbiage: a.ref("Verbiage").required().array(),
    })
    .authorization((allow) => [allow.publicApiKey()]),
});

I see verbiage | null when try to get the list of verbiage from a Customer record:

The type should be verbiage[] | null

If I change the type of Customer.verbiage in the schema to this:

verbiage: a.ref("Verbiage").required().array().required(),

Then I see the correct type of verbiage[] | null from the query results:

I will mark this as a bug for the team to look into further