Node js and Sequelize insert to database - node.js

Question

In my project I am using MySQL database and Sequelize Js,
I have two models created:
Post code model:
module.exports = function(sequelize, Sequelize) {
var Post_code = sequelize.define('post_code', {
id: {
autoIncrement: true,
primaryKey: true,
type: Sequelize.INTEGER(11)
},
code: {
type: Sequelize.STRING(16),
allowNull: false,
unique: true
},
city: {
type: Sequelize.STRING(45),
allowNull: false
}
},{
freezeTableName: true,
underscored: true
});
Post_code.associate = function(models) {
models.post_code.hasMany(models.building);
};
return Post_code;
}
Building model:
module.exports = function(sequelize, Sequelize) {
var Building = sequelize.define('building', {
id: {
autoIncrement: true,
primaryKey: true,
allowNull: false,
type: Sequelize.INTEGER(11)
},
name: {
type: Sequelize.STRING(100),
allowNull: false
},
number: {
type: Sequelize.INTEGER(11),
allowNull: false
},
address: {
type: Sequelize.STRING(255),
allowNull: false
},
latitude: {
type: Sequelize.DECIMAL(9,6),
allowNull: false
},
longitude: {
type: Sequelize.DECIMAL(9,6),
allowNull: false
}
},{
freezeTableName: true,
underscored: true
});
Building.associate = function (models) {
models.building.belongsTo(models.post_code, {
foreignKey: {
allowNull: false
}
});
models.building.hasMany(models.flat);
};
return Building;
};
They are in relation one to many, it follows that Post code has many Buildings:
I want to add new building to database, when POST request is send to this route:
"/post-codes/:post_code_id/buildings"
I have access to post_code_id but I don't know how to correctly associate post_code model with building.
I was trying to do something like this:
models.post_code.findById(req.params.post_code_id)
.then(function(postCode){
postCode.setBuilding(
models.building.create({
}).then(function(building){});
);
});
But without result. I would be grateful if someone could explain how to make inserts correctly.

Answer 1

I haven't heard about the include option on create, but you can do something like this:
db.post_code.find({
where: {
id: req.params.post_code_id
}
}).then(post_code => {
if (!post_code) {
return res.status(404).send({
message: 'No post_code with that identifier has been found'
});
} else {
//create here your building
}
}).catch(err => {
return res.jsonp(err)
});
I don't know if this is the best way to do it, but it verify first if the post_code exists.