Best way to do forward resolution about typegql

[pie6k]

I've also created some example as I think it's quite common use-case:

[pie6k]

Hey @lorefnon

There is great library https://github.com/jakepusateri/graphql-list-fields that is able to give you string[] of needed fields from info variable.

It can be used inside Inject function:

@Schema()
class SuperSchema {
  @Query({ type: [Issue] })
  issues(
    @NeededFields(['creator'])
    relations: string[], 
  ) {
    console.log({ relations });
    // ...
    return repo.find({ relations });
  }
}

I've created function named NeededFields that returns @Inject decorator. I could use @Inject inline, but it'd make schema code less readable. Here is this function definition:

import * as getFieldNames from 'graphql-list-fields';
import { Inject } from 'typegql';

function NeededFields(filterNames: string[] = []) {
  return Inject(({ info }) => {
    const selectionFieldNames: string[] = getFieldNames(info);

    return selectionFieldNames.filter(fieldName => {
      return allowed.includes(fieldName);
    });
  });
}

It takes argument filterNames: string[] so you can filter fields list to only those that are interesting for you (relations in your case).

Let me know if that is helpful for you.

Also, make sure to upgrade typegql to latest version (0.3.0+) as Inject api has changed slightly.

[lorefnon]

This is great! Thanks a lot for your work on this library.