Sequelize - called with something that's not a subclass of Sequelize.Model - node.js

Question

I'm working on app but I having this issue using Node.js and Sequelize for Postgresql :
throw new Error(this.name + '.' + Utils.lowercaseFirst(Type.toString()) + ' called with something that\'s not a subclass of Sequelize.Model');
^
Error: Expense.class BelongsTo extends Association {
constructor(source, target, options) {
super(source, target, options);
<....LOT OF CODE FROM SEQUELIZE ....>
if ((fieldsOrOptions || {}).transaction instanceof Transaction) {
options.transaction = fieldsOrOptions.transaction;
}
options.logging = (fieldsOrOptions || {}).logging;
return association.target.create(values, fieldsOrOptions).then(newAssociatedObject =>
sourceInstance[association.accessors.set](newAssociatedObject, options)
);
}
} called with something that's not a subclass of Sequelize.Model
I don't understand this error, especially the last line "called with something that's not a subclass of Sequelize.Model".
Here is the models :
User model
const models = require('./index');
const Expense = models.User;
module.exports = (sequelize, DataTypes) => {
var User = sequelize.define('User', {
firstname: DataTypes.STRING,
lastname: DataTypes.STRING,
email: DataTypes.STRING,
password: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
User.hasMany(models.Expense);
}
}
});
console.log(models);
User.hasMany(Expense, {as: 'Expenses', foreignKey: 'userId'});
return User;
};
And Expense model
const models = require('./index');
const User = models.User;
module.exports = (sequelize, DataTypes) => {
var Expense = sequelize.define('Expense', {
name: DataTypes.STRING,
amount: DataTypes.INTEGER,
date: DataTypes.INTEGER
}, {
classMethods: {
}
});
Expense.belongsTo(User, { foreignKey: 'userId' });
return Expense;
};
And the controller for creating an expense :
createExpense: function(req, res) {
const user = User.findOne({ where: { id: req.params.id } });
Expense.create({
name: req.body.name,
amount: req.body.amount,
date: req.body.date,
User: user
},{
include: [
{
model: User
}
]
}).then((created) => {
res.status(200).send({ success: true, message: 'Dépense ajoutée !' });
});
}
Does someone have already see an error that look like that ? I search for few days without any issue, if someone could help I'll really appreciate,
thank !

Answer 1

I have a same problem before, but I found a reason. Key point is that your models must under a same sequelize class.
You can look my project mini-shop on github.

Answer 2

Though being 3 years late... I think, it's caused by a bad import. The import in in "User Model" for the "Expense Model" uses this line and looks kind of fishy:
const Expense = models.User;
But from a rather general point of view, this kind of error message might be a hint to an error while creating an association in a line such as User.hasMany(Expense, {as: 'Expenses', foreignKey: 'userId'});
Here is another answer regarding a similar question. For example in my case, the error came from not using the definition name to access my model (<- depends on your setup!)