Sequelize association generate fields that do no exists - node.js

Question

I'm converting a PHP API to a GraphQL api. I'm using Sequelize as ORM package. I have two tables that I want to couple via a hasOne connection.
This is my AdvisoryService model:
module.exports = function(sequelize, DataTypes) {
const AdvisoryService = sequelize.define(
'advisoryService',
{
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true,
field: 'id',
},
country: {
type: DataTypes.INTEGER(11),
allowNull: true,
references: {
model: 'system_country',
key: 'id',
},
field: 'country',
},
//REDACTED
},
{
tableName: 'advisory_service',
timestamps: false,
},
)
AdvisoryService.associate = models => {
AdvisoryService.hasOne(models.systemCountry, {
as: 'Country',
foreignKey: 'country',
})
}
return AdvisoryService
}
And my systemCountry model:
/* jshint indent: 2 */
module.exports = function(sequelize, DataTypes) {
return sequelize.define(
'systemCountry',
{
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true,
field: 'id',
},
oldId: {
type: DataTypes.INTEGER(11),
allowNull: true,
unique: true,
field: 'old_id',
},
subcontinentId: {
type: DataTypes.INTEGER(11),
allowNull: true,
references: {
model: 'system_subcontinent',
key: 'id',
},
field: 'subcontinent_id',
},
code: {
type: DataTypes.STRING(2),
allowNull: false,
field: 'code',
},
longCode: {
type: DataTypes.STRING(3),
allowNull: false,
field: 'long_code',
},
currency: {
type: DataTypes.STRING(255),
allowNull: true,
field: 'currency',
},
currencyCode: {
type: DataTypes.STRING(255),
allowNull: true,
field: 'currency_code',
},
isEu: {
type: DataTypes.INTEGER(1),
allowNull: false,
field: 'is_eu',
},
isAsean: {
type: DataTypes.INTEGER(1),
allowNull: false,
field: 'is_asean',
},
isFragileWb: {
type: DataTypes.INTEGER(1),
allowNull: false,
field: 'is_fragile_wb',
},
isFragilePf: {
type: DataTypes.INTEGER(1),
allowNull: false,
field: 'is_fragile_pf',
},
isFragileOecd: {
type: DataTypes.INTEGER(1),
allowNull: false,
field: 'is_fragile_oecd',
},
title: {
type: DataTypes.STRING(255),
allowNull: false,
field: 'title',
},
latitude: {
type: 'DOUBLE',
allowNull: true,
field: 'latitude',
},
longitude: {
type: 'DOUBLE',
allowNull: true,
field: 'longitude',
},
},
{
tableName: 'system_country',
timestamps: false,
},
)
}
It generates the following query:
Executing (default): SELECT `id`, `old_id` AS `oldId`, `subcontinent_id` AS `subcontinentId`, `code`, `long_code` AS `longCode`, `currency`, `currency_code` AS `currencyCode`, `is_eu` AS `isEu`, `is_asean` AS `isAsean`, `is_fragile_wb` AS `isFragileWb`, `is_fragile_pf` AS `isFragilePf`, `is_fragile_oecd` AS `isFragileOecd`, `title`, `latitude`, `longitude`, `country` FROM `system_country` AS `systemCountry` WHERE `systemCountry`.`country` = 1 LIMIT 1;
And throws the following error: SequelizeDatabaseError: Unknown column 'country' in 'field list'. Which I get, because there is no county field in the system_country table. I don't know why the association generates the country field. Can someone point out what I'm doing wrong?

Answer 1

You relation -
AdvisoryService.associate = models => {
AdvisoryService.hasOne(models.systemCountry, {
as: 'Country',
foreignKey: 'country',
})
}
Is defining the relationship with key - country hence its finding country in systemCountry table
Use the Following object in your relation definition -
{as: "Country", foreignKey: "OtherTableColumn", sourceKey: "SameTableColumn"}