如何在Apollo graphql服务器上运行Node.js

Question

Hi I am using Apollo GraphQL server, mongodb, nodejs in my application. I have schema and resolvers and movies.js

schema.js

const typeDefs = `
    type Movie {
         _id: Int!
        name: String!
    }
    type Query {
        mv: [Movie]
    }
`;
module.exports = typeDefs;

resolvers.js

const mongoDB = require("../mongoose/connect");

const resolvers = {
  Query: {
    mv: async (root, args, context) => {
      return await mongoDB.connectDB(async err => {
        if (err) throw err;
        const db = mongoDB.getDB();
        db
          .collection("movie")
          .find({})
          .toArray(function(err, result) {
            if (err) throw err;
            return JSON.stringify(result);
            db.close();
          });
      });
    }
  }
};
module.exports = resolvers;

movie.js

var express = require("express");
var bodyParser = require("body-parser");
const { graphqlExpress } = require("apollo-server-express");
const { makeExecutableSchema } = require("graphql-tools");

const createResolvers = require("../graphql/resolvers");
const typeDefs = require("../graphql/schema");
const resolvers = require("../graphql/resolvers");

var router = express.Router();

const executableSchema = makeExecutableSchema({
  typeDefs,
  resolvers
});

router.get(
  "/",
  bodyParser.json(),
  graphqlExpress({
    executableSchema
  })
);

module.exports = router;

app.js

var graph = require("./routes/movie");
app.use("/movie", movie);

When I try to access it http://localhost/movie then I am getting this error GET query missing.

Does anyone know what I am doing wrong ?

Answer 1

/movie is declared as a GraphQL endpoint, so you have to send a (GraphQL) query to it.

With GET endpoints, you'd do that by passing the query as a (URL-escaped) query parameter:

http://localhost/movie?query=...

(documented here: http://dev.apollodata.com/tools/apollo-server/requests.html#getRequests )

To post the query { mv { name } } , the URL would become this:

http://localhost:3000/movie?query=%7B%20mv%20%7B%20name%20%7D%20%7D

But I would suggest setting up a POST endpoint so you can send POST requests .

Additionally, you're passing an incorrect property name to graphqlExpress , it should be this:

router.get(
  "/",
  bodyParser.json(),
  graphqlExpress({
    schema : executableSchema
  })
);