Cannot generate Models from GraphQL schema

[Odaym]

Amplify CLI Version

12.10.1

Question

So I have this schema that I use in my Amplify project on AWS. This schema works perfectly fine when going through the motions of integrating Amplify into a project on iOS.

On Android however, there is an issue.

To reproduce this I do:

• amplify pull --appId xxxxxxxx
• amplify pull
• amplify codegen

This successfully generates the Queries, Mutations and Subscriptions under graphql folder with schema.json sitting in that folder.

At this stage the Models are not generated, the actual classes behind that schema, even though on iOS they are in that step above, on Android I have to do an extra step:

• amplify codegen models

And here is where the issue lies, I always get this exception when running that command to get my Models:

Error: Unknown type Vendor for field vendor. Did you forget to add the @model directive
    at AppSyncModelJavaVisitor.getNativeType (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-visitor.js:220:19)
    at AppSyncModelJavaVisitor.getNativeType (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:479:34)
    at AppSyncModelJavaVisitor.generateModelField (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:239:32)
    at /snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:149:18
    at Array.forEach (<anonymous>)
    at AppSyncModelJavaVisitor.generateModelClass (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:147:22)
    at /snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:113:43
    at Array.forEach (<anonymous>)
    at AppSyncModelJavaVisitor.generateModelClasses (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:112:50)
    at AppSyncModelJavaVisitor.generate (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/visitors/appsync-java-visitor.js:44:21)
    at Object.plugin (/snapshot/amplify-cli/build/node_modules/@aws-amplify/appsync-modelgen-plugin/lib/plugin.js:55:24)
    at /snapshot/amplify-cli/build/node_modules/@graphql-codegen/core/cjs/execute-plugin.js:36:54
    at /snapshot/amplify-cli/build/node_modules/@graphql-codegen/core/node_modules/@graphql-codegen/plugin-helpers/cjs/profiler.js:7:49

I have a workaround wherein I replace Vendor and Product from interface to type and have them both implement a duplicate inteface instead, and in all occurrences of implements Product and implements Vendor I place implements IProduct and implements IVendor. This makes the codegen generate the Models successfully, but I don't want to have to do that.

What can I do to have this schema work as it should?

Is this schema AppSync comaptible?

If not, how can I convert it to be compatible and have this flow work as it should? Because remember, I still don't have the code for the Queries/Mutations/Subscriptions that are supposed to be using the generated Models, that still has to happen when I run my project and the appsync gradle plugin does its job (which it also fails for another reason).

What can I do?

Thanks.

[ykethan]

Hey, 👋 thanks for raising this! I'm going to transfer this over to our codegen repository for better assistance 🙂

[dpilch]

interface is not currently supported for the Amplify GraphQLAPI or the codegen utilities.