I am trying to establish a belongsToMany relationship between two models, User and Company.

I think I have done everything right, but the funny thing is that the api shows me the results relationships when I query User, but when I try to query Company, it gives me the following error:

User is not associated to Company!

These are my two models and the relations:

user.model.js

export default (sequelize, DataTypes) => {
  const User = sequelize.define('User', 
    {
      id: { type: DataTypes.INTEGER, allowNull: false, primaryKey: true, autoIncrement: true },
      name:  { type: DataTypes.STRING, allowNull: false },
      password:  { type: DataTypes.STRING },
      email: { type: DataTypes.STRING, unique: true }   
    }, 
    {
      tableName: 'users',
      paranoid: true,
      timestamps: true,
      underscored: true
    });

  User.associate = models => {
    User.belongsToMany(models.Company, { 
      through: 'CompanyUsers',
      as: 'companies',
      foreignKey: 'user_id'
    });
  };

  return User;
};

company.model.js

export default (sequelize, DataTypes) => {
  const Company = sequelize.define('Company', 
    {
      id: { type: DataTypes.INTEGER, allowNull: false, primaryKey: true, autoIncrement: true },
      name: { type: DataTypes.STRING, allowNull: false },
      code: { type: DataTypes.STRING, allowNull: false },
      disabled: { type: DataTypes.BOOLEAN, defaultValue: false },
    }, 
    {
      tableName: 'companies',
      paranoid: true,
      timestamps: true,
      underscored: true      
    });

    Company.associate = models => {
      Company.belongsToMany(models.User, { 
        through: 'CompanyUsers',
        as: 'users',
        foreignKey: 'company_id'         
      });
    };

  return Company;
};

Any idea?

Thanks!!