Develop Reference

Insert data from javascript file into mongodb using graphql

I am new to using Graphql and MongoDB. I am trying to insert data from an existing javascript file where the data has been defined. I was trying to use a mutation in order to achieve this but I have no clue what I'm really doing. Any help would be nice.
const dotenv = require('dotenv');
dotenv.config();
const { ApolloServer, gql } = require('apollo-server');
const { MongoClient } = require('mongodb');
const items = require('./itemsListData');
const typeDefs = gql`
type Query {
items:[Item!]!
}
type Item{
id:ID!,
name:String!,
aisle:String!,
bay:String!,
price:Float!,
xVal:Int!,
yVal:Int!
}
type Mutation {
createItem(name: String!, aisle: String!): Item!
}
`;
console.log(items)
const resolvers = {
Query: {
items:() => items,
},
Item:{
id: ( { _id, id }) => _id || id,
},
Mutation: {
createItem: async(_, { name }, { db }) => {
// name:String!, bays:[Bay!]!, xStartVal:Int!, xEndVal:Int!, yStartVal:Int!, yEndVal:Int!
const newItem = {
items
}
// insert Item object into database
const result = await db.collection('Items').insert(newItem);
console.log("This is the result " + result);
return result.ops[0]; // first item in array is the item we just added
}
}
};
const start = async () => {
const client = new MongoClient("mongodb+srv://admin:admin#quickkartcluster.o0bsfej.mongodb.net/test", { useNewUrlParser: true, useUnifiedTopology: true });
await client.connect();
const db = client.db("QuickKart");
const context = {
db,
}
const server = new ApolloServer({
typeDefs,
resolvers,
context,
introspection: true
});
// The `listen` method launches a web server.
server.listen().then(({ url }) => {
console.log(`🚀 Server ready at ${url}`);
});
}
start();
here is my javascript data file
https://pastebin.com/wvGANBgR

Why could the findOrCreate plugin create several documents at once?

I'm currently working on a MERN application with following/follower function for the users. I decided to create separate schemas for following and follower relationships detached from user schema.
Follower schema
const mongoose = require('mongoose');
const findOrCreate = require('mongoose-findorcreate');
const ObjectId = mongoose.Schema.Types.ObjectId;
const followerSchema = mongoose.Schema({
userId: {
type: ObjectId,
ref: 'User'
},
follower: {
type: [ObjectId],
ref: 'User'
}
});
followerSchema.plugin(findOrCreate);
const Follower = mongoose.model('Follower', followerSchema);
module.exports = { followerSchema, Follower };
Following schema
const mongoose = require('mongoose');
const findOrCreate = require('mongoose-findorcreate');
const ObjectId = mongoose.Schema.Types.ObjectId;
const followingSchema = mongoose.Schema({
userId: {
type: ObjectId,
ref: 'User'
},
following: {
type: [ObjectId],
ref: 'User'
}
});
followingSchema.plugin(findOrCreate);
const Following = mongoose.model('Following', followingSchema);
module.exports = { followingSchema, Following };
The problem however starts in my service where followings are created as supposed to. However, for followers mongoose create 6-8 documents at once with userIds that don't even exist in my db.
Here's the code of the followerService (it's the first function)
const { Follower } = require('../models/followerModel');
const { Following } = require('../models/followingModel');
const { User } = require('../models/userModel');
const mongoose = require('mongoose');
exports.changeFollowStatus = async (user, userId) => {
console.log({ userId: userId, user: user._id });
const newFollowing = await Following.findOrCreate({ userId: user._id }, (err, following, created) => {
console.log({following: following});
if (!err && !isFollowing(following, userId)) {
following.following.push(mongoose.Types.ObjectId(userId));
following.save();
User.findByIdAndUpdate(mongoose.Types.ObjectId(userId), {$inc: {follower: 1}});
} else {
const followingIndex = following.following.indexOf(mongoose.Types.ObjectId(userId));
following.following.splice(followingIndex, 1);
following.save();
User.findByIdAndUpdate(mongoose.Types.ObjectId(userId), { $inc: { follower: -1 } });
}
});
const newFollower = await Follower.findOrCreate({ userId: mongoose.Types.ObjectId(userId) }, (err, follower, created) => {
console.log({follower: follower});
if (!err && !isFollower(follower, user._id)) {
follower.follower.push(user._id);
follower.save();
User.findByIdAndUpdate(user._id, { $inc: { following: 1 } });
} else {
const followerIndex = follower.follower.indexOf(user._id);
follower.follower.splice(followerIndex, 1);
follower.save();
User.findByIdAndUpdate(user._id, { $inc: { following: -1 } });
}
});
};
exports.showFollowings = async (userId) => {
const followings = await Following.findOrCreate({ userId: mongoose.Types.ObjectId(userId) });
return followings.following;
};
exports.showFollowers = async (userId) => {
const followers = await Follower.findOrCreate({ userId: mongoose.Types.ObjectId(userId) });
return followers.follower;
};
const isFollowing = (newFollowing, userId) => {
return newFollowing.following.includes(mongoose.Types.ObjectId(userId));
};
const isFollower = (newFollower, userId) => {
return newFollower.follower.includes(userId);
}
Now, my following adding code and follower adding code look almost identical, but for some reason for followers, mongoose creates many more documents. The strange thing is that there is a follower document with the correct userId, but many other with random userIds get created which doesn't happen with followings which works as supposed to.
I also checked whether I pass the correct values and everything seems to be fine. But just for reference, here's the controller function from which I pass the values.
exports.changeFollowingStatus = async (req, res, next) => {
passport.authenticate('jwt', async (err, user, info) => {
if (err) {
console.error({ authError: err });
};
if (info !== undefined) {
console.error({ authError: info.message });
res.status(403).send(info.message);
} else {
console.log({params: req.params});
const userToFollow = req.params.id;
await FollowerService.changeFollowStatus(user, userToFollow);
res.status(200).send({ message: 'success' })
}
})(req, res, next);
};
Could anyone help me with this bug or at least navigate me towards the right direction? I can't seem to find solution to my problem. Thank you all in advance!

How do I update a foreign key (belongsTo) in Sequelize

I have the following model:
'use strict';
const {Model} = require('sequelize');
module.exports = (sequelize, DataTypes) => {
class Key extends Model {
static associate(models) {
Key.belongsTo(models.User, {
foreignKey: 'userId',
onDelete: 'CASCADE'
});
}
};
Key.init({
keyType: DataTypes.STRING,
key: DataTypes.JSON
}, {
sequelize,
modelName: 'Key',
});
return Key;
};
I then try to create a row, after receiving userId, keyType and key:
...
const Key = KeyModel(sequelize, Sequelize);
const createKey = async (userid, keyType, key) => {
const result = await Key.create({userId, keyType, key});
return result;
}
The row gets created successfully in the DB, and i get back an ID (the createdAt and updatedAt are updated as well), but the userId is null.
How should I pass it to the create method so the value gets to the DB? Am I missing something in the model?
PS: the DB is MySQL 8.

I think you should change your code like below.
'use strict';
const {Model} = require('sequelize');
module.exports = (sequelize, DataTypes) => {
class Key extends Model {
static associate(models) {
Key.belongsTo(models.User, {
foreignKey: 'keyId',
targetKey: 'userId'
onDelete: 'CASCADE'
});
}
};
Key.init({
keyId: DataTypes.STRING,
keyType: DataTypes.STRING,
key: DataTypes.JSON
}, {
sequelize,
modelName: 'Key',
});
return Key;
};
const Key = KeyModel(sequelize, Sequelize);
const createKey = async (userId, keyType, key) => {
const result = await Key.create({keyId: userId, keyType, key});
return result;
}

Mongoose find by a subdocument's value

I have 2 schemas
const schema = Schema({
headLine: {
type: String,
required: false
},
availableDays: [{
type: Schema.Types.ObjectId,
ref: AvailableDay
}]
}, {collection: 'providers', timestamps: true});
module.exports = mongoose.model("Provider", schema);
const schema = Schema({
day: {
type: String,
enum: ['Mondays','Tuesdays','Wednesdays','Thursdays','Fridays','Saturdays','Sundays']
},
timeFrom: String,
timeTo: String
}, {collection: 'availableDays', timestamps: true});
module.exports = mongoose.model("AvailableDay", schema);
Then in a route I call to a repository like this
router.get('/', async (req, res) => {
const match = {};
const sort = {};
const options = {};
// Arrange sort
if(req.query.sortBy){
const sortArray = JSON.parse(req.query.sortBy);
sortArray.map(e => sort[e[0]] = e[1] && e[1] === 'desc' ? -1 : 1);
options['sort'] = sort
}
// Get the pagination: limit how many, skip where it starts
if(req.query.limit) {
options['limit'] = parseInt(req.query.limit);
}
if(req.query.skip) {
options['skip'] = parseInt(req.query.skip);
}
const docs = await ProviderRepository.findBy(match, {}, options);
res.status(200).json(docs)
});
So what I need here is to filter providers for an AvailableDay monday and return the docs and count the total docs for pagination. I'm doing something like this without success
const findBy = async (params, projection = "", options = {}, callback) => {
const data = () => {
Provider.find(params, projection, options)
.populate([{path: 'user', match: {gender: 'F'}}]).exec((error, e) => {
if (error) {
console.log('error:', error)
return {error: error}; // returns error in json
}
return e.filter(i => i.user);
});
};
const total = await Provider.countDocuments(params).exec();
return {data(), total}
}
Thanks in advance

Use mongoose-aggregate-paginate-v2 and update your schema. If you use that package then you have to convert your queries from populate to aggregate style.
STEP 1: Update schema. Sample Schema:
const mongoose = require('mongoose');
const mongoosePaginate = require('mongoose-aggregate-paginate-v2');
const Schema = mongoose.Schema;
let definition = {
headLine: {
type: String,
required: false
},
availableDays: [{
type: Schema.Types.ObjectId,
ref: AvailableDay
}]
};
let options = {
collection: 'providers'
};
let providerSchema = new Schema(definition, options);
providerSchema.plugin(mongoosePaginate);
module.exports = mongoose.model('providers', providerSchema);
STEP 2: Update controller. Sample code in controller:
router.get('/', async (req, res) => {
const match = {}
const sort = {
// Fill it based on your sort logic.
}
const paginateOptions = {
page: req.query.page, // Page number like: 1, 2, 3...
limit: req.query.limit // Limit like: 10, 15, 20...
};
ProviderRepository
.findBy(match, {}, sort, paginateOptions)
.then(() => {
res.status(200).json(docs)
})
.catch(() => {
res.status(HTTP_ERROR_CODE).json({ "error": "Your error message" })
})
});
STEP 3: Update manager. Sample code in manager:
const findBy = (match, projection, sort, paginateOptions) => {
if (!paginateOptions) {
paginateOptions = {
pagination: false
};
}
let providerAggregate = providerSchema.aggregate([
{
$lookup: {
from: "availableDays",
let: { days: "$availableDays" },
pipeline: [
{
$match: {
$expr: {
$in: ["$$availableDays", "$day"]
}
}
}
],
as: "availableDays"
}
},
{
$lookup: {
from: "users", // I dont know the collection name
let: { user_id: "$user" }
pipeline: [
{
$match: {
"gender": 'F',
$expr: {
$eq: ["$_id", "$$user_id"]
}
}
}
],
as: "users"
}
}
{ $sort: sort }
]);
return providerSchema
.aggregatePaginate(providerAggregate, paginateOptions)
.then(res => {
return res;
})
.catch(err => {
throw err;
});
};

GraphQL server with Deno

It works just once for the below code
import {
graphql,
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
buildSchema,
} from "https://cdn.pika.dev/graphql/^15.0.0";
import { serve } from "https://deno.land/std#0.50.0/http/server.ts";
var schema = new GraphQLSchema({
query: new GraphQLObjectType({
name: "RootQueryType",
fields: {
hello: {
type: GraphQLString,
resolve() {
return "world";
},
},
},
}),
});
var query = "{ hello }";
graphql(schema, query).then((result) => {
console.log(result);
});
How to keep it listening, just like express
Something like this
var express = require('express');
var graphqlHTTP = require('express-graphql');
var { buildSchema } = require('graphql');
// Construct a schema, using GraphQL schema language
var schema = buildSchema(`
type Query {
hello: String
}
`);
// The root provides a resolver function for each API endpoint
var root = {
hello: () => {
return 'Hello world!';
},
};
var app = express();
app.use('/graphql', graphqlHTTP({
schema: schema,
rootValue: root,
graphiql: true,
}));
app.listen(4000);
console.log('Running a GraphQL API server at http://localhost:4000/graphql');

import {
graphql,
buildSchema,
} from "https://cdn.pika.dev/graphql/^15.0.0";
import {Application, Router} from "https://deno.land/x/oak/mod.ts";
var schema = buildSchema(`
type Query {
hello: String
}
`);
var resolver = {hello: () => 'Hello world!'}
const executeSchema = async (query:any) => {
const result = await graphql(schema, query, resolver);
return result;
}
var router = new Router();
router.post("/graph", async ({request, response}) => {
if(request.hasBody) {
const body = await request.body();
const result = await executeSchema(body.value);
response.body = result;
} else {
response.body = "Query Unknown";
}
})
let app = new Application();
app.use(router.routes());
app.use(router.allowedMethods());
console.log("Server running");
app.listen({port: 5000})

You can now use https://deno.land/x/deno_graphql to achieve this goal.
It provides everything needed out-of-the-box and works with multiple Deno frameworks (oak, abc, attain, etc).
This is how you code looks like (with oak for example):
import { Application, Context, Router } from "https://deno.land/x/oak/mod.ts";
import {
gql,
graphqlHttp,
makeExecutableSchema,
} from "https://deno.land/x/deno_graphql/oak.ts";
const typeDefs = gql`
type Query {
hello: String
}
`;
const resolvers = {
Query: {
hello: () => "Hello world!",
},
};
const context = (context: Context) => ({
request: context.request,
});
const schema = makeExecutableSchema({ typeDefs, resolvers });
const app = new Application();
const router = new Router();
router.post("/graphql", graphqlHttp({ schema, context }));
app.use(router.routes());
await app.listen({ port: 4000 });
PS : i'm the author of the package, so you can ask me anything.
Hope this helps!

Here is an example using oak working with your GraphQL code.
First let's say you have a repository graphRepository.ts with your graph schema:
import {
graphql,
GraphQLSchema,
GraphQLObjectType,
GraphQLString
} from "https://cdn.pika.dev/graphql/^15.0.0";
var schema = new GraphQLSchema({
query: new GraphQLObjectType({
name: "RootQueryType",
fields: {
hello: {
type: GraphQLString,
resolve() {
return "world";
},
},
},
}),
});
export async function querySchema(query: any) {
return await graphql(schema, query)
.then(async (result) => {
return result;
});
}
Now start your app.ts listener with the routes, and use the following URL to call the endpoint:
http://localhost:8000/graph/query/hello
import { Application, Router } from "https://deno.land/x/oak/mod.ts";
import { querySchema } from "./graphRepository.ts";
const router = new Router();
router
.get("/graph/query/:value", async (context) => {
const queryValue: any = context.params.value;
const query = `{ ${queryValue}}`
const result = await querySchema(query);
console.log(result)
context.response.body = result;
})
const app = new Application();
app.use(router.routes());
app.use(router.allowedMethods());
await app.listen({ port: 8000 });

here is a code example using oak and middleware.
You also can enjoy the playground GUI like an apollo one.
import { Application } from "https://deno.land/x/oak/mod.ts";
import { applyGraphQL, gql } from "https://deno.land/x/oak_graphql/mod.ts";
const app = new Application();
app.use(async (ctx, next) => {
await next();
const rt = ctx.response.headers.get("X-Response-Time");
console.log(`${ctx.request.method} ${ctx.request.url} - ${rt}`);
});
app.use(async (ctx, next) => {
const start = Date.now();
await next();
const ms = Date.now() - start;
ctx.response.headers.set("X-Response-Time", `${ms}ms`);
});
const types = gql`
type User {
firstName: String
lastName: String
}
input UserInput {
firstName: String
lastName: String
}
type ResolveType {
done: Boolean
}
type Query {
getUser(id: String): User
}
type Mutation {
setUser(input: UserInput!): ResolveType!
}
`;
const resolvers = {
Query: {
getUser: (parent: any, {id}: any, context: any, info: any) => {
console.log("id", id, context);
return {
firstName: "wooseok",
lastName: "lee",
};
},
},
Mutation: {
setUser: (parent: any, {firstName, lastName}: any, context: any, info: any) => {
console.log("input:", firstName, lastName);
return {
done: true,
};
},
},
};
const GraphQLService = applyGraphQL({
typeDefs: types,
resolvers: resolvers
})
app.use(GraphQLService.routes(), GraphQLService.allowedMethods());
console.log("Server start at http://localhost:8080");
await app.listen({ port: 8080 });

I have created gql for making GraphQL servers that aren't tied to a web framework. All of the responses above show Oak integration but you don't really have to use it to have a GraphQL server. You can go with std/http instead:
import { serve } from 'https://deno.land/std#0.90.0/http/server.ts'
import { GraphQLHTTP } from 'https://deno.land/x/gql/mod.ts'
import { makeExecutableSchema } from 'https://deno.land/x/graphql_tools/mod.ts'
import { gql } from 'https://deno.land/x/graphql_tag/mod.ts'
const typeDefs = gql`
type Query {
hello: String
}
`
const resolvers = {
Query: {
hello: () => `Hello World!`
}
}
const schema = makeExecutableSchema({ resolvers, typeDefs })
const s = serve({ port: 3000 })
for await (const req of s) {
req.url.startsWith('/graphql')
? await GraphQLHTTP({
schema,
graphiql: true
})(req)
: req.respond({
status: 404
})
}