Sequelize defining tables pluralized when using sync - node.js

Question

I've written migrations to define my tables in a seperate service. Im then using a node.js service to run sequelize where i'm defining my models like this:
import Sequelize from "sequelize";
import sequelize from "../config/sequelize";
export const MasterPlaylist = sequelize.define("Master_playlist", {
id: { type: Sequelize.STRING, primaryKey: true },
updated_at: {
type: Sequelize.DATE,
defaultValue: new Date(),
allowNull: false,
},
});
Im then importing this and calling it like so:
import Sequelize from "sequelize";
import sequelize from "./config/sequelize";
import { Label } from "./models/Label";
async function run(){
await sequelize.sync();
const label = await Label.findOne();
console.log("done", label);
}
run()
Have simplified things slightly here, but this is whats being run.
When i run this it creates new tables but pluralised so i end up with the correctly named tables as inserted by the migrations and then pluralised copies.
For example for this table i end up with 'Master_playlists'
Anyone got an idea whats happening here?
here is my config file:
import Sequelize from "sequelize";
const sequelize = new Sequelize(
process.env.DB,
process.env.USERNAME,
process.env.PASSWORD,
{
host: process.env.HOST,
dialect: "postgres",
}
);
async function run() {
await sequelize.authenticate();
}
run();
export default sequelize;

Answer 1

Not exactly sure what the issue is, but sequelize uses inflection to pluralize table names.
By default, when the table name is not given, Sequelize automatically pluralizes the model name and uses that as the table name. This pluralization is done under the hood by a library called inflection, so that irregular plurals (such as person -> people) are computed correctly.
You can control the table names directly using freezeTableName: true which will keep the table name the same as model name:
sequelize.define('User', {
// ... (attributes)
}, {
freezeTableName: true
});
or specify the table name explicitly:
sequelize.define('User', {
// ... (attributes)
}, {
tableName: 'users'
});