Sequelize belongsTo query results in belongsTo called with something that's not a subclass of Sequelize.Model error - mysql

Question

I am trying to write a join query using belongsTo but getting error:
Error: LearningCertificateEvent.belongsTo called with something that's
not a subclass of Sequelize.Model
at Function. (/Users/msmexmac/node/msmex-backend/msmex-api/node_modules/sequelize/lib/associations/mixin.js:93:13)
I am trying to fetch events related to learning cerfificate events. I tried every thing but it does not work somehow.
My models are as follows:
LearningCertificate Model
"use strict";
const Sequelize = require("sequelize");
const sequelize = require("../helpers/db");
const LearningCertificateEvent = require("./LearningCertificateEvent");
const LearningCertificate = sequelize.define(
"LearningCertificate",
{
id: {
autoIncrement: true,
type: Sequelize.BIGINT,
primaryKey: true,
},
userId: {
type: Sequelize.INTEGER,
field: "user_id",
},
certificateURL: {
type: Sequelize.STRING,
field: "certificate_url",
},
certificatePNGURL: {
type: Sequelize.STRING,
field: "certificate_png_url",
},
certificateType: {
type: Sequelize.STRING,
field: "certificate_type",
},
createdAt: {
type: Sequelize.BIGINT,
field: "created_at",
},
updatedAt: {
type: Sequelize.BIGINT,
field: "updated_at",
},
},
{
timestamps: false,
tableName: "learning_certificate",
}
);
LearningCertificate.hasMany(LearningCertificateEvent, {
foreignKey: "certificateId",
});
module.exports = LearningCertificate;
The second model is : LearningCertificateEvent Model
"use strict";
const Sequelize = require("sequelize");
const sequelize = require("../helpers/db");
const MsmexEvent = require("./MsmexEvent");
const LearningCertificateEvent = sequelize.define(
"LearningCertificateEvent",
{
id: {
autoIncrement: true,
type: Sequelize.BIGINT,
primaryKey: true,
},
userId: {
type: Sequelize.INTEGER,
field: "user_id",
},
certificateId: {
type: Sequelize.INTEGER,
field: "certificate_id",
},
eventId: {
type: Sequelize.INTEGER,
field: "event_id",
},
createdAt: {
type: Sequelize.BIGINT,
field: "created_at",
},
updatedAt: {
type: Sequelize.BIGINT,
field: "updated_at",
},
},
{
timestamps: false,
tableName: "learning_certificate_event",
}
);
LearningCertificateEvent.belongsTo(MsmexEvent, {
foreignKey: "eventId",
});
// MsmexEvent.hasMany(LearningCertificateEvent, {
// foreignKey: "eventId",
// });
module.exports = LearningCertificateEvent;
And last model is: MsmexEvent Model
"use strict";
const Sequelize = require("sequelize");
const sequelize = require("../helpers/db");
const LearningCertificateEvent = require("./LearningCertificateEvent");
const Event = sequelize.define(
"Event",
{
id: {
autoIncrement: true,
type: Sequelize.BIGINT,
primaryKey: true,
},
identifier: {
type: Sequelize.STRING,
field: "identifier",
},
expertId: {
type: Sequelize.INTEGER,
field: "expert_id",
},
waitList: {
type: Sequelize.BOOLEAN,
field: "waitList",
},
},
{
timestamps: false,
tableName: "msmex_event",
}
);
module.exports = Event;
The query which I have written is as follows:
return LearningCertificate.findAll({
where: {
userId: userId,
},
include: [
{
model: LearningCertificateEvent,
required: true,
include: [
{
model: MsmexEvent,
required: true,
},
],
},
],
order: [["id", "DESC"]],
});
In query however if I replace MsmexEvent with some other table for example User it works fine.
Can some one please help ?