CODEWITHSUNDEEP
node.jsmongodbapigraphql
BallmersLeak
BallmersLeak

Reputation: 107

What should you check when graphQL's query return's empty data from mongodb?

I'm attempting to translate a Flask api to a graphql server. I can get example code to work with a test mongodb collection but I cannot get my adapted code to work on the real mongodb server. The query always returns an empty data response. What are the steps to debug this code? enter image description here

const Express = require("express");
const { graphqlHTTP } = require('express-graphql');
const Mongoose = require("mongoose");
const {
    GraphQLID,
    GraphQLString,
    GraphQLList,
    GraphQLNonNull,
    GraphQLObjectType,
    GraphQLSchema
} = require("graphql");

var app = Express();

Mongoose.connect("mongodb://localhost/treasure-chess");

//"persons" is the collection 
const GameModel = Mongoose.model("game", {
    black: String,
    white: String
});

const GameType = new GraphQLObjectType({
    //the name field here doesn't matter I guess...
    name: "Game",
    fields: {
        id: { type: GraphQLID },
        black: { type: GraphQLString },
        white: { type: GraphQLString }
    }
});

const schema = new GraphQLSchema({
    query: new GraphQLObjectType({
        name: "Query",
        fields: {
            games: {
                type: GraphQLList(GameType),
                resolve: (root, args, context, info) => {
                    return GameModel.find().exec();
                }
            },
            game: {
                type: GameType,
                args: {
                    id: { type: GraphQLNonNull(GraphQLID) }
                },
                resolve: (root, args, context, info) => {
                    return GameModel.findById(args.id).exec();
                }
            }
        }
    }),
    mutation: new GraphQLObjectType({
        name: "Mutation",
        fields: {
            game: {
                type: GameType,
                args: {
                    firstname: { type: GraphQLNonNull(GraphQLString) },
                    lastname: { type: GraphQLNonNull(GraphQLString) }
                },
                resolve: (root, args, context, info) => {
                    var game = new GameModel(args);
                    return game.save();
                }
            }
        }
    })
});

app.use("/graphql", graphqlHTTP({
    schema: schema,
    graphiql: true
}));


app.listen(3000, () => {
    console.log("Listening at :3000...");
});

Proof that I'm connecting to the right mongodb document:

enter image description here

More proof:

enter image description here

I did attempt the comment suggestion only to find that the result was empty...:

                    var results = GameModel.find().exec()
                    results.then(game_info =>{
                        console.log(game_info)
                    })

Upvotes: 3

Views: 653

Answers (1)

BallmersLeak
BallmersLeak

Reputation: 107

I found the answer after trying a bunch of different searches on stackoverflow. It turns out that mongoose.model assumes that whatever parameter you pass is singular and pluralizes it by default. So I actually had to pass in:

const GameModel = Mongoose.model("game", gameSchema, "game");

Granted most people probably won't experience this error as they probably named their collections with this in mind, there might be the one odd person who wanted to utilize a different name for their collection OR the plural of the collection is the same singular. I'll leave this up for others, happy coding!

Upvotes: 1

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