I’m new to NodeJs/Sequelize. I have declared this model :

'use strict';
const {
  Model
} = require('sequelize');
module.exports = (sequelize, DataTypes) => {
  class Ingredient extends Model {

    static associate(models) {
      Ingredient.belongsTo(models.Department, { foreignKey: 'departmentId' });
    }
  };
  Ingredient.init({
    id: {
      type: DataTypes.INTEGER,
      autoIncrement: true,
      primaryKey: true,
    },
    name:
    {
      type: DataTypes.STRING,
      allowNull: false,
    },
    departmentId: {
      type: DataTypes.INTEGER,
      allowNull: false,
    }
  }, {
    sequelize,
    modelName: 'Ingredient',
  });
  return Ingredient;
};

And in my ingredient.controler, in create() method I try to instanciate an Ingredient with :

 const ingredient = Ingredient.build({
    name: req.body.name,
    departmentId: req.body.departmentId,
  })

as said in their doc, but I get an error :

Ingredient.build is not a function

I also tried with a new()

  const ingredient = new Ingredient({
     name: req.body.name,
     departmentId: req.body.departmentId,
  });

but I also get an error :

Ingredient is not a constructor

What do I miss?