nodejs sequelize join 2 table using hasmany - node.js

Question

I am new in nodejs. I am creating new app using nodejs. i want to join two table city and state using hasmany relations.
Here is my state model state.js
module.exports = function(sequelize, DataTypes) {
return sequelize.define('state', {
name: {
type: DataTypes.STRING(255),
allowNull: true
},
id: {
type: DataTypes.INTEGER(10).UNSIGNED,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
createdAt: {
type: DataTypes.DATE,
allowNull: true
},
updatedAt: {
type: DataTypes.DATE,
allowNull: true
}
}, {
tableName: 'state'
});
};
Here is my city model city.js
module.exports = function(sequelize, DataTypes) {
return sequelize.define('city', {
state: {
type: DataTypes.INTEGER(11),
allowNull: true
},
name: {
type: DataTypes.STRING(255),
allowNull: true
},
id: {
type: DataTypes.INTEGER(10).UNSIGNED,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
createdAt: {
type: DataTypes.DATE,
allowNull: true
},
updatedAt: {
type: DataTypes.DATE,
allowNull: true
}
}, {
tableName: 'city'
});
};
This is my citycontroller.js
let City = require('../models').city;
let State = require('../models').state;
let message = require('../../config/message');
let Boom = require('boom');
module.exports = {
listCity: async(request,h) =>{
let stateid = request.query.stateid;
try{
let searchQuery = {};
if(stateid) searchQuery.state = stateid;
let listCity = await City.findAll({ where:searchQuery});
if(listCity.length){
let response = {
"statusCode": 200,
"message":message.DATAFOUND,
"result": listCity
};
return h.response(response).code(200);
}else{
return h.response(response).code(204);
}
}catch(err){
return Boom.badRequest(err.message);
}
},
};
Output:
{
"statusCode": 200,
"message": "Data found",
"result": [
{
"state": 1,
"name": "Los Angeles",
"id": 1,
"createdAt": null,
"updatedAt": null
},
{
"state": 1,
"name": "San Francisco",
"id": 2,
"createdAt": null,
"updatedAt": null
},
{
"state": 5,
"name": "Southhampton",
"id": 3,
"createdAt": null,
"updatedAt": null
}
]
}
Now it listing city details only. but i need to join state details also under each city.

Answer 1

If you want to select the data from the state table than define a relation in the state model.
module.exports = function(sequelize, DataTypes) {
const state = sequelize.define('state', {
name: {
type: DataTypes.STRING(255),
allowNull: true
},
id: {
type: DataTypes.INTEGER(10).UNSIGNED,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
createdAt: {
type: DataTypes.DATE,
allowNull: true
},
updatedAt: {
type: DataTypes.DATE,
allowNull: true
}
}, {
tableName: 'state'
});
state.associate = function(model){
models.state.hasMany(models.city){
foreignKey: 'state'
}
return state;
}
};
Or if you want to select data from the city table than define a similar hasOne relation in city table.