I set up the following tables and I use a many-to-many connection:
const Product = sequelize.define('Product',
{
name: DataTypes.STRING,
quantity: DataTypes.INTEGER
},
{ freezeTableName: true });
const Cart = sequelize.define('Cart',
{
customer_name: DataTypes.STRING,
total: DataTypes.FLOAT
});
const CartItem = sequelize.define('CartItem', {
selfGranted: DataTypes.BOOLEAN
},
{ timestamps: false });
Cart.belongsToMany(Product, { through: CartItem });
Product.belongsToMany(Cart, { through: CartItem });
And when I proceed to get the data, on the first request it sends me Relation doesn't exist error.
I forgot to remove the database re-sync.
db.sequelize.sync({ force: true }).then(() => {
console.log("Drop and re-sync db.");
});
Related
I have 2 schema's, Categories and Cards. Each Category has an array of cards, and I want to populate that array with values , but I am unsure how to go about this as the mongoose documentation is somewhat confusing to understand.
// Schemas in seperate files
// Category Schema
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const categorySchema = new Schema({
title: {
type: String,
trim: true,
max: 30,
},
cards: [{ type: Schema.Types.ObjectId, ref: "categoryCard" }],
});
module.exports = mongoose.model("category", categorySchema);
// Category Card Schema
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const categoryCardSchema = new Schema({
category: {
type: String,
trim: true,
},
name: {
type: String,
trim: true,
},
post: {
type: String,
required: true,
trim: true,
},
});
module.exports = mongoose.model("categoryCard", categoryCardSchema);
// Below is the express router file . I want users to be able to create cards for different categories , after the category is already created. It worked in postman, but it doesn't work on the front end for some reason.
router.route("/createCard").post((req, res) => {
const { title, name, post } = req.body;
newCard = new categoryCard({
category: title,
name,
post,
});
newCard.save();
category.findOne({ title }).exec((err, item) => {
if (!err) {
item.cards.push(newCard._id);
item.save();
res.send(item);
} else {
res.send(err);
}
});
});
You can Follow this code...
let categorys= await category.findOne({ title }).populate("cards")
I have to connect to a Postgres database in Node.js and I want to switch schemas dynamically Using Sequelize Library.
Here is my Table Model and Controller Code.
module.exports = function (sequelize, DataTypes) {
const customer = sequelize.define(
'customer',
{
id: {
autoIncrement: true,
primaryKey: true,
type: DataTypes.INTEGER,
},
schema_name: {
type: DataTypes.STRING,
allowNull: false,
},
created_on: {
type: DataTypes.DATE,
allowNull: false,
defaultValue: DataTypes.NOW(),
},
},
{
schema: 'public',
}
)
return customer
}
And Controller Code
exports.login = async (req, res, next) => {
const { email, password, domain } = req.body
const domainData = await customer.findOne({
where: { schema_name: domain },
})
console.log('Log: exports.login -> domainData', domainData)
}
Once the response received I have to Switch Schemas Dynamically according to the above result.
Help me Guys Please
I resolved the problem using sequelize.query() function.
for getting Domain...
const domainData = await sequelize.query(
`SELECT schema_name from public.customer_management_client where schema_name = '${domain}'`
)
for switching to dynamic schema
const UserData = await sequelize.query(
`SELECT * from ${domainData[0][0].schema_name}.user_access_user where email = '${email}'`
)
Main objective:
On call to route I either get a new or update existing CartItem object.
The Object amount and total are passed in the middleware so the object total gets recalculated.
The Schema seems to properly apply its middleware properly on the first request (based on the console logs).
However I only get an object with the updated total if I make another http request.
This is beyond my understanding and I would appreciate some assistance.
Schema:
const mongoose = require('mongoose');
const uniqueValidator = require('mongoose-unique-validator');
const Product = require('./Product');
const Cart = require('./Cart');
const refIsValid = require('../middleware/refIsValid');
const cartItemSchema = mongoose.Schema({
name: { type: String },
productRef: { type: mongoose.Schema.Types.ObjectId, ref: 'Product', required: true },
cartRef: { type: mongoose.Schema.Types.ObjectId, ref: 'Cart', required: true },
price: { type: Number, default: 0 },
imgUrl: { type: String },
amount: { type: Number, required: true },
total: { type: Number, default: 0 },
active: { type: Boolean, default: true },
uniqueName: { type: String, unique: true },
});
cartItemSchema.path('productRef').validate((value, respond) => {
return refIsValid(value, respond, Product);
}, 'Invalid product ref.');
cartItemSchema.path('cartRef').validate((value, respond) => {
return refIsValid(value, respond, Cart);
}, 'Invalid cart ref.');
cartItemSchema.path('price').get(function(num) {
return num.toFixed(2);
});
cartItemSchema.pre('save', async function(next) {
const refCart = await Cart.findById(this.cartRef).lean().exec();
const refProduct = await Product.findById(this.productRef).lean().exec();
const uniqueName = `${refProduct._id}_${refCart._id}`;
this.name = refProduct.name;
this.price = refProduct.price;
this.imgUrl = refProduct.imgUrl;
this.total = (this.price * this.amount).toFixed(2);
this.uniqueName = uniqueName;
next();
});
cartItemSchema.post('findOneAndUpdate', async function(result) {
console.log('TCL: result', result);
await result.save(function(err) {
if (err) {
console.error('ERROR!');
}
});
console.log('TCL: docToUpdate', result);
});
cartItemSchema.plugin(uniqueValidator);
module.exports = mongoose.model('cartItem', cartItemSchema);
controller:
static async updateOrCreate(req, res, next) {
try {
let { cartRef, productRef, amount } = req.body;
let options = { upsert: true, new: true, setDefaultsOnInsert: true };
// const uniqueName = `${productRef._id}_${cartRef._id}`;
const updateOrCreate = await CartItem.findOneAndUpdate(
{ cartRef: cartRef, productRef: productRef },
{ amount: amount },
options,
);
if (updateOrCreate) {
const result = await CartItem.findById(updateOrCreate._id);
console.log('TCL: CartItemController -> updateOrCreate -> result', result);
res.status(200).json({
isNew: false,
message: 'item updated',
productItem: result,
});
return;
}
} catch (error) {
error.statusCode = 500;
next(error);
}
}
I am trying to create a model using Sequelize and mysql db.I am trying to post to '/students/register' it keeps giving me an error saying findOne is not a function. I tried requiring my sql but it's not working ..I also tried a different function like findAll and still not working.what seems to be the problem
const Sequelize = require('sequelize');
module.exports = function (sequelize, Sequelize) {
const Stundet = sequelize.define(
'student', {
id: {
type: Sequelize.INTEGER,
primaryKey: true,
autoIncrement: true
},
name: {
type: Sequelize.STRING
},
email: {
type: Sequelize.STRING
},
password: {
type: Sequelize.STRING
},
created: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
}
}, {
timestamps: false
});
module.exports = Stundet;
}
routes
const Student_Info = require("../models/students")
student.post('/register', (req, res) => {
const dataToday = new Date()
const studentData = {
name: req.body.name,
email: req.body.email,
password: req.body.password,
created: dataToday
}
Student_Info.findOne({
where: {
email: req.body.email
}
})
.then(student => {
if (!student) {
bcrypt.hash(req.body.password, 10, (err, hash) => {
studentData.password = hash
Student_Info.create(studentData)
.then(student => {
res.json({
status: student.email + 'registered'
})
})
.catch(err => {
res.send('error' + err)
})
})
} else {
res.json({
error: 'Student already registered'
})
}
})
.catch(err => {
res.send('error' + err)
})
})
module.exports = student;
When you use module.exports, you should return Stundet. You already export the whole function. And I think you should pass DataTypes instead of Sequelize.
Something like this:
module.exports = function (sequelize, DataTypes) {
const Stundet = sequelize.define(
//...
return Stundet;
}
So in your route in order to use your model:
const Sequelize = require('sequelize');
const DataTypes = sequelize.DataTypes;
let sequelize = new Sequelize(...);
const Student = require('../models/students')(sequelize, DataTypes);
I suspect that your Student_Info is null. Does you application successfully connect to the database? It helps to log... e.g.
sequelizeDB
.authenticate()
.then(() => {
console.log('Yes! DB Connection);
...
})
.catch(err => {
console.error('No! Unable to connect to DB', err);
});
... and IMHO the code reads better when you name the DB instance something other than "sequelize".
I have been having SO much trouble trying to get a mutation to work.
Given this GraphQL Schema, can anyone PLEASE help me create a simple create User mutation? I don't understand what I am missing. I got it to a point where it throws a 400 error from the GraphQL server and it does not fire the resolve function.
var userType = new GraphQLObjectType({
name: 'User',
description: 'User creator',
fields: () => ({
id: {
type: new GraphQLNonNull(GraphQLString),
description: 'The id of the user.'
},
email: {
type: GraphQLString,
description: 'The email of the user.'
},
business: {
type: GraphQLString,
description:
'The name of the business of the user as the app refers to it.'
},
businessDisplayName: {
type: GraphQLString,
description: 'The name of the business of the user as they typed it in.'
},
trips: {
type: new GraphQLList(tripType),
description: 'The trips of the user, or an empty list if they have none.',
resolve: (user, params, source, fieldASTs) => {
var projections = infoToProjection(fieldASTs)
return Trip.find(
{
_id: {
// to make it easily testable
$in: user.trips.map(id => id.toString())
}
},
projections,
function(err, docs) {
return docs
}
)
}
}
})
})
var schema = new GraphQLSchema({
query: new GraphQLObjectType({
name: 'root',
fields: {
trips: {
type: new GraphQLList(tripType),
resolve: function() {
return Trip.find({})
}
},
users: {
type: new GraphQLList(userType),
resolve: function() {
return User.find({})
}
},
user: {
type: userType,
args: {
id: {
name: 'id',
type: new GraphQLNonNull(GraphQLString)
}
},
resolve: (root, { id }, source, fieldASTs) => {
return User.findOne(
{ _id: id },
infoToProjection(fieldASTs),
function(err, doc) {
return doc
}
)
}
},
trip: {
type: tripType,
args: {
id: {
name: 'id',
type: new GraphQLNonNull(GraphQLString)
}
},
resolve: (root, { id }, source, fieldASTs) => {
var projections = infoToProjection(fieldASTs)
return Trip.findOne({ _id: id }, projections, function(err, doc) {
return doc
})
}
}
}
}),
// mutation
mutation: new GraphQLObjectType({
name: 'Mutation',
fields: {
createUser: {
name: 'createUser',
type: userType,
args: {
input: { type: new GraphQLInputObjectType({
name: 'user',
fields: {
business: { type: GraphQLString },
email: { type: GraphQLString },
businessDisplayName: { type: GraphQLString }
}
})
}},
resolve: (parentValue, args) => {
let user = new User({ ...args.input })
user.save()
return user
}
}
})
})
export var getProjections = infoToProjection
export default schema
This works with GraphiQL using the following queries or mutations:
mutation {
createUser(input:{business:"business", email: "e#mai.l", businessDisplayName: "businessDN"}) {
id
email
business
businessDisplayName
}
}
fragment UserFragment on User {
id
business
businessDisplayName
trips{
title
}
}
{
hideya: user(id: "someid") {
...UserFragment
}
}
I finally fixed the problem. Tried to understand the source of the problem so I used a new NetworkLayer to enable appropriate logging and meaningful error messages. Then threw the an error when my mutation failed. The error message was : "Cannot query field clientMutationId". Looked that up and found that to be able to mutate objects you need to have that field on your GraphQL type. So I added it.
Lesson learned: I highly recommend using react-relay-network-layer.
More details:
Here is my code for it:
import {
RelayNetworkLayer,
urlMiddleware,
batchMiddleware,
} from 'react-relay-network-layer';
Relay.injectNetworkLayer(new RelayNetworkLayer([
batchMiddleware({
batchUrl: 'http://localhost:3000/graphql',
}),
urlMiddleware({
url: 'http://localhost:3000/graphql',
}),
]));
Note: This enables logging and by default it's a simple console.log.
Here is how I threw the error:
const params = {
email: email.toLowerCase(),
businessDisplayName: business,
business: business.toLowerCase()
}
var onSuccess = () => {
console.log('Mutation successful!')
}
var onFailure = transaction => {
var error = transaction.getError() || new Error('Mutation failed.')
console.error(error)
}
Relay.Store.commitUpdate(new FindOrCreateUser({ user: { ...params } }), { onFailure, onSuccess })
And of course you always need to clean your cache and restart your packager.