Sequelize associations: Can't add associations, throws TypeError - postgresql

Question

I am a newbie to postgres and Sequelize. I come from NoSQL background, so this is a bit daunting to me.
First of all this is my project directory:
server/
components/
center/
center.model.js
center.controller.js
center.routes.js
So, I am following a modules based architecture.
Here's my center.models.js:
const Sequelize = require('sequelize');
const sequelize = require('../../config/sequelize');
const Inventory = require('../inventory/inventory.model');
const Center = sequelize.define('center', {
name: {
type: Sequelize.TEXT,
allowNull: false,
validate: {
notEmpty: true,
},
},
zone: {
type: Sequelize.TEXT,
allowNull: false,
validate: {
notEmpty: true,
},
},
lat: {
type: Sequelize.DOUBLE,
},
long: {
type: Sequelize.DOUBLE,
},
nearest_metro: {
type: Sequelize.TEXT,
},
metro_distance: {
type: Sequelize.DOUBLE,
},
address: {
type: Sequelize.TEXT,
},
google_map: {
type: Sequelize.TEXT,
},
landmark: {
type: Sequelize.TEXT,
},
landmark_directions: {
type: Sequelize.TEXT,
},
active: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
created_at: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
},
updated_at: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
}
});
Center.hasMany(Inventory);
module.exports = Center;
And this is my SpacePartner model:
const Sequelize = require('sequelize');
const sequelize = require('../../config/sequelize.js');
const Center = require('../center/center.model.js');
const SpacePartner = sequelize.define('space_partner', {
name: {
type: Sequelize.TEXT,
allowNull: false,
validate: {
notEmpty: true,
},
},
active: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
created_at: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
},
updated_at: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
}
});
SpacePartner.hasMany(Center);
module.exports = SpacePartner;
And this is how I am using the two models in my space_partner.controller.js:
const CreateSpacePartner = async (req, res) => {
try {
const {
spacePartner,
center,
inventory,
} = req.body;
const [createdSP, createdCenter, createdInventory] = await Promise.all([SpacePartner.create(spacePartner), Center.create(center), Inventory.create(inventory)]);
createdCenter.addSpacePartner(createdSP);
createdInventory.addCenter(createdCenter);
createdInventory.addInventoryType(inventory.inventory_type_id);
const [updatedCenter, updatedInventory] = await Promise.all([createdCenter.save({
fields: ['space_partner_id']
}), createdInventory.save({
fields: ['center_id', 'inventory_type_id']
})]);
return res.status(200).json({
spacePartner: createdSP,
center: updatedCenter,
inventory: updatedInventory,
});
} catch (e) {
console.log(e);
return res.status(500).json({
message: 'Sorry, we are facing some issue right now. Please, try again later.',
});
}
};
Now, the issue is that I am getting TypeError on addSpacePartner addCenter and addInventoryType.
I was following the official docs.
I did go through other tutorials, but they had more of MVC architecture, I don't want to go back to restructuring my code.
Any help would this would be great.

Answer 1

For this to work createdCenter.addSpacePartner(createdSP);, to work, we need to define the relationship between Center and SpacePartner. So it should be
Center.hasMany(SpacePartners)
Once you have this, these functions should be available to you.
You can read more about association here
The code for Inventory is not posted, so its hard to say about that.