Breaking the schema into separate group of files.

Leave a reply

Having the entire schema into the server.js file is not practical, especially if the schema grows bigger, so let’s move the schema into separate folders for easy management:

mkdir ./src/schema/queries -p
mkdir ./src/schema/types -p
mkdir ./src/schema/mutations -p

./src/schema/index.js

const graphql = require('graphql');
const queries = require('./queries');
const mutations = require('./mutations');

var rootQuery = new graphql.GraphQLObjectType({
  name: 'Query',
  fields: {...queries, ...mutations },
});

module.exports = new graphql.GraphQLSchema({
  query: rootQuery
});

./src/schema/types/index.js

let Dogs = require('./dogs.js');

module.exports = {
  ...Dogs,
};

./src/schema/types/dogs.js

const graphql = require('graphql');

module.exports = new graphql.GraphQLObjectType({
  name: 'dogType',
  fields: {
    id: { type: graphql.GraphQLString },
    breed: { type: graphql.GraphQLString },
    displayImage: { type: graphql.GraphQLString },
  }
});

./src/schema/queries/index.js

let Dogs = require('./dogs.js');

module.exports = {
  ...Dogs
};

./src/schema/queries/dogs.js

const graphql = require('graphql');
const dogType = require('../types/dogs');
const dogs = require('../../models/mock_data/dogs.js');

module.exports = {
  getDogByBreed: {
    type: dogType,
    args: {
      breed: { type: graphql.GraphQLString }
    },
    resolve: function (_, {breed}) {
      var result = dogs.find(function(dog){
        return breed == dog.breed;
      });
      return result;
    }
  } 
}

./src/schema/mutations/index.js

let Dogs = require('./dogs.js');

module.exports = {
  ...Dogs
};

./src/schema/mutations/dogs.js

const graphql = require('graphql');
const dogs = require('../../models/mock_data/dogs.js');

module.exports = {
  addDogBreed: {
    type: graphql.GraphQLString,
    args: {
      id: { type: graphql.GraphQLString },
      breed: { type: graphql.GraphQLString },
      displayImage: { type: graphql.GraphQLString }
    },
    resolve: function (_, {id, breed, displayImage}) {
      dogs.push({
        id: id,
        breed: breed,
        displayImage: displayImage
      });
      return "OK!";
    }
  }   
}

./server.js

var express = require('express');
var graphqlHTTP = require('express-graphql');
const schema = require('./src/schema');


// Logger middleware
var logger = function(req, res, next) {
  console.log("GOT REQUEST >", req.ip);
  next(); // Passing the request to the next handler in the stack.
}

var app = express();
app.use(logger);
app.use('/graphql', graphqlHTTP({
  schema: schema,
  graphiql: true,
}));
app.listen(4000);
console.log('Running a GraphQL API server at localhost:4000/graphql');

 

Leave a Reply