Sequelize obtain associated model data in the property - mysql

Question

I've two models, User and Category
User model:
module.exports = (sequelize, DataTypes) => {
const User = sequelize.define('User', {
id: {
type: DataTypes.BIGINT(19),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
firstname: {
type: DataTypes.STRING(150),
allowNull: false
},
lastname: {
type: DataTypes.STRING(150),
allowNull: false
},
email: {
type: DataTypes.STRING(255),
allowNull: false,
unique: true
},
password: {
type: DataTypes.STRING(255),
allowNull: false
}
}, {
tableName: 'users',
timestamps: true,
createdAt: 'created_at',
updatedAt: 'updated_at',
defaultScope: {
attributes: {
exclude: ['password']
}
},
scopes: {
withPassword: {
attributes: {}
}
}
})
User.prototype.toJSON = function () {
let values = Object.assign({}, this.get())
delete values.password
return values
}
return User
}
Category model:
module.exports = (sequelize, DataTypes) => {
const Category = sequelize.define('Category', {
id: {
type: DataTypes.BIGINT(19),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING(150),
allowNull: false
},
created_by: {
type: DataTypes.BIGINT(19),
allowNull: false,
references: {
model: 'users',
key: 'id'
}
}
}, {
tableName: 'categories',
timestamps: true,
createdAt: 'created_at',
updatedAt: 'updated_at'
})
Category.associate = (models) => {
Category.belongsTo(models.User, {
foreignKey: 'created_by'
})
}
return Category
}
My query to find the category:
const category = await Category.findOne({
include: [{
model: User,
required: true,
attributes: ['id', 'firstname', 'lastname', 'email']
}],
where: {
id: req.params.id
},
limit: 1
})
When I execute the query, the response I expected was,
{
"id": 1,
"name": "License",
"created_by": {
"id": 1,
"firstname": "Magesh",
"lastname": "Kumaar",
"email": "mk#test.com"
},
"created_at": "2018-09-03T07:41:29.000Z",
"updated_at": "2018-09-03T07:41:29.000Z"
}
But the response I obtained was,
{
"id": 1,
"name": "License",
"created_by": 1, // I expected the user information here
"created_at": "2018-09-03T07:41:29.000Z",
"updated_at": "2018-09-03T07:41:29.000Z",
"User": {
"id": 1,
"firstname": "Magesh",
"lastname": "Kumaar",
"email": "mk#test.com"
}
}
The user information is available at both created_by as Id and another User property that contains other information
I tried the as option, but it didn't seem to work. Is there any way to get the user information in the created_by key itself.

Answer 1

Need use aliases.
http://docs.sequelizejs.com/manual/tutorial/associations.html
Example:
index.js
require('dotenv').load();
const { User, Category } = require('./models');
const sequelize = require('./database');
(async () => {
await sequelize.sync({ force: true });
await Category.associate({ User });
await User.create({
firstname: 'firstname',
lastname: 'lastname',
email: 'email#email.email',
password: 'password',
});
await Category.create({
name: 'name',
created_by: '1',
});
const category = await Category.findOne({
attributes: ['id'],
include: {
model: User,
required: true,
as: 'created',
attributes: ['id', 'firstname', 'lastname', 'email']
},
where: {
id: 1,
},
});
console.log(category.toJSON());
})();
Category Model file:
module.exports = (sequelize, DataTypes) => {
const Category = sequelize.define('Category', {
id: {
type: DataTypes.BIGINT(19),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING(150),
allowNull: false
},
created_by: {
type: DataTypes.BIGINT(19),
allowNull: false,
references: {
model: 'users',
key: 'id'
}
}
}, {
tableName: 'categories',
timestamps: true,
createdAt: false,
updatedAt: false,
});
Category.associate = (models) => {
Category.belongsTo(models.User, {
foreignKey: 'created_by',
as: 'created',
})
};
return Category;
};
result:
{ id: 1,
created:
{ id: 1,
firstname: 'firstname',
lastname: 'lastname',
email: 'email#email.email' } }