Throw multiple graphql errors

[drmax24]

Is it possible to throw multiple graphql errors from resolver? How to do it?

Let's say I have a file upload service and I validate file contents. I want to send all errors that are present inside a file as an array to an error section of my graphql response.

[mfn]

This library provides the config error_formatter and errors_handler; the latter which deals with all (multi) errors and latter which is responsible for formatting a singular error.

The defaults for example support \Illuminate\Validation\ValidationException, which is a single exception / error but contains a "bag of messages", which usually correlate to fields somehow. What this approach does is using a GraphQL non-standard way to have a single entry in the GraphQL errors response using the reserved but free-to-use extensions key and adds whatever payloads suite it.

This was just an example how it could be done; there two other option quickly coming to my mind:

• throw and handle multiple errors/exception
  Technically it's supported by the underlying graphql-php but I have not tried this approach. It would mean something like \GraphQL\Executor\ExecutionResult::__construct and passing multiple $errors
• use the GraphQL type system and make the mutation in question return a union, e.g. mutation myAwesomeUploader : (UploadedFileData | MoreSpecificErrors { error } )
  i.e. the mutation returns an union consisting of either the object UploadedFileData or the object MoreSpecificErrors containing multiple errors as strings or whatever you want. You'd have to come up with the types of your own.
  The benefit of this is that you've a typed and flexible system. But it might also be overkill and e.g. the first suggestion with the ValidatinException is more appropriate.

Does that help? Maybe if you describe a bit more details about your use-case I can help more.

[drmax24]

Technically it's supported by the underlying graphql-php but I have not tried this approach. It would mean something like

Your suggestion is probably a bit more clean and out of the box then:
webonyx/graphql-php#207

That would be interesting to know how to populate errors array exactly. We will try to investigate it...