I don’t prefer using count to check for record existence. Suppose you have similarity for hundred in million records why to count them all if you want just to get boolean value, true if exists false if not? findOne will get the job done at the first value when there’s matching. const isIdUnique = id … Read more
Though poorly documented, this does exist in Sequelize. Couple Ways: 1. For any response object that resulted from a query, you can extract only the data you want by appending .get({plain:true}) the the response like so: Item.findOrCreate({…}) .spread(function(item, created) { console.log(item.get({ plain: true })) // logs only the item data, if it was found or … Read more
I have encountered a similar issue in my project. The way I choose to implement it is a bit different for two reasons: If at one point in time Sequelize decides to implement sub queries – the syntax is ready. Use Sequelize protection against SQL injection. Here is my code snippet, hope it helps. Sequelize … Read more
When your application needs to retrieve data from the database, it creates a database connection. Creating this connection involves some overhead of time and machine resources for both your application and the database. Many database libraries and ORM’s will try to reuse connections when possible, so that they do not incur the overhead of establishing … Read more
Table.findAll({ attributes: [‘id’, [‘first’, ‘firstName’]] //id, first AS firstName }) .then(function(posts) { res.json(posts); });
Assuming you have the right association between users and login, you can just create a user including a login: User.create({ name: “name”, Login: {…} },{ include: Login }) you can find more information here: https://sequelize.org/docs/v6/advanced-association-concepts/creating-with-associations/
For anyone finding this later on it’s now possible to explicitely define what the database field should be named: var User = sequelize.define(‘user’, { isAdmin: { type: DataTypes.BOOLEAN, field: ‘is_admin’ } });
Use the bulkCreate to bulkUpdate method. bulkCreate([…], { updateOnDuplicate: [“name”] }) updateOnDuplicate is an array of fields that will be updated when the primary key (or may be unique key) match the row. Make sure you have at least one unique field (let say id) in your model and in the dataArray both for upsert. … Read more
The reason is: sequelize is not installed globally on your cli. To get sequelize access to all your cli just do. npm install -g sequelize-cli The ‘-g’ means global this will allow you to access sequelize command anywhere in your app directory. After that you can do eg: sequelize model:generate –name User –attributes firstName:string,lastName:string,email:string,password:string
If you want to handle the specific error, attach a .catch handler models.Item.create({ title : req.body.title, UserId : req.body.UserId }).then(function(item){ res.json({ “Message” : “Created item.”, “Item” : item }); }).catch(function (err) { // handle error; }); If you want to handle errors more generally (i.e. show a nice error message, instead of killing your server, … Read more