Sequelize Model associations - foreign key missing - postgresql

Question

I have 2 models that I am associating like this. Customer is associated to application by 1:M relationship.
customer:
'use strict';
module.exports = (sequelize, DataTypes) => {
let customer = sequelize.define('customer', {
id: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING
},
account_id: {
type: DataTypes.STRING
},
code: {
type: DataTypes.STRING
},
createdAt: {
type: DataTypes.DATE,
defaultValue: sequelize.literal('NOW()')
},
updatedAt: {
type: DataTypes.DATE,
defaultValue: sequelize.literal('NOW()')
}
},
{
underscored: true,
freezeTableName: true,
tableName: 'customer'
});
customer.associate = function(models) {
// associations can be defined here
customer.hasMany(models.application, { foreignKey:
'customer_id' });
};
sequelize.sync()
.then(() => customer.create(
{ name: "customer1", account_id: "cust-1-acct-1", code: "ACME Inc." }
)).then(function(customer) {
console.log('customers created');
}).then(() => customer.create(
{ name: "customer2", account_id: "cust-2-acct-2", code: "test Cust" }
)).then(function(customer) {
console.log('customers created');
})
.catch(function(err) {
console.log(err);
});
return customer;
}
application:
'use strict';
module.exports = (sequelize, DataTypes) => {
let application = sequelize.define('application', {
id: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING,
sortable: true
},
creation_date: {
type: DataTypes.NUMERIC,
sortable: true
},
customer_id: {
type: DataTypes.INTEGER
},
createdAt: {
type: DataTypes.DATE,
defaultValue: sequelize.literal('NOW()')
},
updatedAt: {
type: DataTypes.DATE,
defaultValue: sequelize.literal('NOW()')
}
},
{
underscored: true,
freezeTableName: true,
tableName: 'application'
});
application.associate = function(models) {
// associations can be defined here
application.belongsTo(models.customerView, { through: 'customer_id' });
};
sequelize.sync()
.then(() => application.create(
{ customer_id: "1", name: "application 1", creation_date: "1556724178700" }
)).then(() => application.create(
{ customer_id: "1", name: "application 2", creation_date: "1556724178700" }
)).then(() => application.create(
{ customer_id: "2", name: "application 3", creation_date: "1556724178700" }
))
.then(function(application) {
console.log('applications created');
})
.catch(function(err) {
console.log(err);
});
return application;
}
These 2 tables are getting created as expected, but without the foreign key constraint that I am expecting. The foreign key should be on the application table, on customer_id.
What am I doing wrong?