node.js - hasMany called with something that's not an instance of Sequelize.Model

Question

as you guys can see my issue is related to the title description, i created a User Model, and a Foto Model in sequelize, basicly a user can shoot many fotos, but each foto can be related to just 1 user.

My User model

    "use strict";
var sequelize = require('./index');
var bcrypt = require('bcrypt-nodejs');
var Foto = require('./Foto');

module.exports = function (sequelize, DataTypes) {
  var User = sequelize.define("User", {
    username: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true,
      validate: {
        isUnique: function (value, next) {
          var self = this;
          User.find({ where: { username: value } })
            .then(function (user) {
              // reject if a different user wants to use the same username
              if (user && self.id !== user.id) {
                return next('username already in use!');
              }
              return next();
            })
            .catch(function (err) {
              return next(err);
            });
        }
      }
    },

    email: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true,
      validate: {
        isUnique: function (value, next) {
          var self = this;
          User.find({ where: { email: value } })
            .then(function (user) {
              // reject if a different user wants to use the same email
              if (user && self.id !== user.id) {
                return next('Email already in use!');
              }
              return next();
            })
            .catch(function (err) {
              return next(err);
            });
        }
      }
    },

    typeOfUser: {
      type: DataTypes.INTEGER,
      allowNull:true,
      defaultValue:null
    },

    country: {
      type: DataTypes.STRING,
      allowNull:true,
      defaultValue:null
    },

    birthDate:{
      type: DataTypes.DATEONLY,
      allowNull:true,
      defaultValue:null
    },

    reports: {
      type: DataTypes.INTEGER,
      defaultValue: 0
    },

    points: {
      type: DataTypes.INTEGER,
      defaultValue: 0
    },

    password: {
      type: DataTypes.STRING,
      allowNull:false
    },

    numberFotos: {
      type: DataTypes.INTEGER,
      defaultValue: 0
    }
  }, {
      classMethods: {
        generateHash: function (password) {
          return bcrypt.hashSync(password, bcrypt.genSaltSync(8), null);
        },

      },
      instanceMethods: {
        validPassword: function (password) {
          return bcrypt.compareSync(password, this.password);
        }
      }


    });

  User.hasMany(Foto,{as: 'fotos', foreignKey: 'userId'})

  return Foto;
}

My foto model

"use strict";
var sequelize = require('./index');
var bcrypt = require('bcrypt-nodejs');
var User = require('./User');


module.exports = function (sequelize, DataTypes) {
  var Foto = sequelize.define("Foto", {
    reports: {
      type: DataTypes.INTEGER,
      defaultValue: 0
    },
    image: {
      type: DataTypes.STRING,
      allowNull: false
    },
    date: {
      type: DataTypes.DATE,
      allowNull:true
    },
    position: {
      type: DataTypes.RANGE,
      allowNull: true
    }
  });

  Foto.belongsTo(User, {foreignKey: 'userId'});

  return Foto;
}

Answer 1

You don't need to declare the association on the Photo Model:

Foto.belongsTo(User, {foreignKey: 'userId'});

When you have a 1:N relation between models you only need to refer the id from the "1" model, on our case the User model, on the "N" model, Photos. So doing:

User.hasMany(Foto,{as: 'fotos', foreignKey: 'userId'})

Will create a column on your Foto table with name "userId" that refer to user table. On this way both models are associate as you want.