Resolving query type with promise in bucklescript

Question

I've got this query im trying to test with with the reason graphql_ppx library. code gist

This is a screenshot of the editor type annotations:

Using the @mhallin/graphql_ppx library, i've got the following query set up:

    module FilmQuery = [%graphql
  {|
    {
      allFilms {
        films {
          id
          title
          releaseDate
        }
      }
    }
|}
];

exception Graphql_error(string);

/* Construct a "packaged" query; FilmQuery takes no arguments: */
let filmQuery = FilmQuery.make();

/* Send this query string to the server */
let query = filmQuery##query // type string

I get an the following error when i send the query to the server it returns the following error.

{ errors: [ { message: 'Must provide query string.' } ] }

But if you Js.log(query) you see its being constructed which works on https://swapi.apis.guru

query films($first: Int)  {
  allFilms(first: $first)  {
   films  {
     id  
     title  
     releaseDate  
   }
  }
}

If you Js.log(filmQuery) you get:

{ query: 'query   {\nallFilms  {\nfilms  {\nid  \ntitle  \nreleaseDate  \n}\n}\n}',

variables: null, parse: [Function: parse] }

If your run the same query in Altair and you check the query that was sent in the devtools network tab you see:

{"query":"    query films($first: Int) {\n      allFilms(first: $first) {\n        films {\n          id\n          title\n          releaseDate\n        }\n      }\n    }\n","variables":{}}

The editor is provided this type error: "- error [bucklescript] This has type: string But somewhere wanted: Js.t({.. query : string, variables : Js.Json.t }) string"

How do I get this promise/unit type resolved? Thank you.

So the new question is: Why isn't the sendQuery() function recognizing the filmQuery##parse key?

Looks like you may want to be passing `filmQuery` into `sendQuery` instead of the `query` variable. — Neil Kistner, Feb 25 '18 at 15:32

score 0 · Answer 1 · answered Feb 27 '18 at 13:47

Your sendQuery method is expecting a type in the shape of what is returned from FilmQuery.make(), but you are passing it just the query property, which is a string.

You can fix this by passing filmQuery as into sendQuery instead of just the query property from filmQuery that is referenced by the query variable.

Resolving query type with promise in bucklescript

1 Answers1