Model A is not associated to Model B sequelize error

Question

I have the following problem, I have 2 Models: Client

module.exports = (sequelize, DataTypes) => {
const Client = sequelize.define('Client', {      
  first_name: DataTypes.STRING,
  last_name: DataTypes.STRING,
  phone: DataTypes.STRING,
  mobile_phone: DataTypes.STRING,
  email: DataTypes.STRING,                             
});

//creating association Client with Gender
Client.associate = function (models) {
  Client.hasOne(models.Gender, {     
       //     
  });
};


return Client; }

and Gender:

module.exports = (sequelize, DataTypes) => {
const Gender = sequelize.define('Gender', {      
  name: DataTypes.STRING,                             
});

//creating association Gender with Employee
Gender.associate = function (models) {
  models.Gender.hasMany(models.Employee, {   
    //                         
  });
};

//creating association Gender with Client
Gender.associate = function (models) {
  models.Gender.belongsTo(models.Client, { 
    foreignKey: 'gender_id'                   
  });
};

return Gender; }

My ClientController:

const { Client, Gender } = require('../models');

class ClientController {

  // Apresenta todos os resgistros do determinado Model
  async index (req, res) {
      const clients = await Client.findAll({});

      return res.status(200).json({
          status: 'ok',
          clients
      });
  }

  // Apresenta os atributos setados de um resgistro específico
  async show (req, res) {
      const client = await Client.findAll({
          attributes: ['id', 'first_name', 'last_name', 'phone', 'mobile_phone', 'email'],
          where: {
              id: req.params.id
          },
          include: [{
              model: Gender,                 
              attributes: [],

          }],
      });

      return res.status(200).json({
          status: 'ok',
          client
      });
  }

  // Cria e salva um resgistro do Model especificado
  async store (req, res) {
      const client = await Client.create(req.body);

      return res.status(201).json({
          status: 'created',
          client
      });
  }

  // Edita e salva um resgistro do Model especificado
  async update (req, res) {
      const { first_name, last_name, phone, mobile_phone, email } = req.body;

      const client = await Client.update({
          first_name: first_name,
          last_name: last_name,
          phone: phone,
          mobile_phone: mobile_phone,
          email: email

      }, {
          where: {
              id: req.params.id
          }
      });

      return res.status(200).json({
          status: 'updated',
          client
      });
  }

  // Exclui um resgistro do Model especificado
  async destroy (req, res) {
      await Client.destroy({
          where: {
              id: req.params.id
          }
      });

      return res.status(204).json({
          status: 'removed'
      });
  }
}

module.exports = new ClientController()

But the following returns to me:

node ./bin/www

api:server Listening on port 3000 +0ms (node:16328) UnhandledPromiseRejectionWarning: SequelizeEagerLoadingError: Gender is not associated to Client! at Function._getIncludedAssociation (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\sequelize\\lib\\model.js:715:13) at Function._validateIncludedElement (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\sequelize\\lib\\model.js:619:53) at options.include.options.include.map.include (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\sequelize\\lib\\model.js:516:37) at Array.map () at Function._validateIncludedElements (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\sequelize\\lib\\model.js:511:39) at Promise.try.then.then (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\sequelize\\lib\\model.js:1726:14) at tryCatcher (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\util.js:16:23) at Promise._settlePromiseFromHandler (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\promise.js:547:31) at Promise._settlePromise (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\promise.js:604:18) at Promise._settlePromise0 (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\promise.js:649:10) at Promise._settlePromises (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\promise.js:729:18) at _drainQueueStep (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\async.js:93:12) at _drainQueue (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\async.js:86:9) at Async._drainQueues (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\async.js:102:5) at Immediate.Async.drainQueues [as _onImmediate] (C:\\SISTEMA-REACT-EXPRESS\\api\\node_modules\\bluebird\\js\\release\\async.js:15:14) at runCallback (timers.js:705:18) at tryOnImmediate (timers.js:676:5) at processImmediate (timers.js:658:5) (node:16328) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:16328) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Obs: In n: m relationships with pivot Table, everything is normal, could someone help me?

Answer 1

You're overwriting your first association with the second one:

//creating association Gender with Employee
Gender.associate = function (models) {
  models.Gender.hasMany(models.Employee, {   
    //                         
  });
};

//creating association Gender with Client
Gender.associate = function (models) {
  models.Gender.belongsTo(models.Client, { 
    foreignKey: 'gender_id'                   
  });
};

just combine them into a single one:

//creating Gender associations
Gender.associate = function (models) {
  models.Gender.hasMany(models.Employee, {   
  models.Gender.belongsTo(models.Client, { 
    foreignKey: 'gender_id'                   
  });
};