Amplify-cli: Do we fully support fragments?

[brunostuani]

* Which Category is your question related to? *
GraphQL transformer codegen

* Provide additional details e.g. code snippets *
I'm adding a fragment in a custom GraphQL query file. For example:

fragment SheetParts on Sheet {
  id,
  name,
  bpm,
}

query ListItemPage($id: ID!) {
  getList(id: $id) {
    name,
    sheets {
      items {
        ...SheetParts
      }
    }
  }
}

query MyLibraryPage($limit: Int, $nextToken: String) {
  listSheets(limit: $limit, nextToken: $nextToken) {
    nextToken,
    items {
      ...SheetParts
    }
  }
}

Codegen gracefully generates SheetPartsFragment into my API, but when requesting the qery through the generated API, I get this error:

core.js:15724 ERROR Error: Uncaught (in promise): Object: {"data":null,"errors":[{"path":null,"locations":[{"line":9,"column":9,"sourceName":null}],"message":"Validation error of type UndefinedFragment: Undefined fragment SheetParts @ 'getList/sheets/items'"}]}

Am I missing something?

Thanks

[brunostuani]

This seems a bug in the angular service generation. The fragment definition is missing in the generated API queries. It works if I manually edit the generated service and add the missing fragment after the query.

[SwaySway]

@brunostuani Currently Amplify Codegen does not support fragments. Marking this as an enhancement.

[ChristopheBougere]

As my GraphQL schema is getting bigger, I was looking for a similar solution and just discovered fragments.
This would be a very nice addition to the CLI!

Is there a way to make it work by bypassing the codegen part, or are fragments simply not usable on Amplify ?
Here is the alternative I was considering (a client query builder): https://github.com/atulmy/gql-query-builder
But having this handled server-side would be much better.

[artemkloko]

I have been using a hacky implementation for some time now and finally managed to assemble it as a plugin https://github.com/artemkloko/amplify-graphql-fragments-generator

It supports only TypeScript and is not for production. Still would be nice if someone could test it on a playground project or comment on the strategy itself.

[jcbdev]

@artemkloko I'm really liking the look of that library! I have also created your first issue! (sorry!) - https://github.com/artemkloko/amplify-graphql-fragments-generator/issues/1

let me know if you need any help with the issue 👍