itopiz

itopiz

How to stop a field resolution after a middleware returns an error?

In my GraphQL schema, I am using an authentication middleware similar to the one in the documentation. This middleware is set for all mutation fields.
In some mutation fields, I also want to use the Absinthe.Relay.Node.ParseIDs middleware.

In case a user is not authenticated and submits a mutation with an input that does not pass the ParseIDs middleware, the server returns the error message:

In argument \"input\": In field \"userId\": Could not decode ID value `foobar'

but I was expecting:

unauthenticated

After reading the Absinthe.Middleware documentation, I understand that both the authentication and ParseIDs middlewares are run anyway.

All middleware on a field are always run, make sure to pattern match on the state if you care.

When no user is authenticated, is there a way to receive the error message “unauthenticated” regardless of the input provided?

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tspenov

tspenov

@itopiz

        resolution
        |> Absinthe.Resolution.put_result({:error, unauthenticated()})

changes the state of the Resolution struct to resolved.
So you can add a clause in ParseIDs middleware to catch this case and pass like this:

  def call(%Resolution{state: :resolved} = resolution, _) do
    resolution
  end

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