jsonapi_resource GET call not returning data - ruby-on-rails

Question

I am new to rails. I have been trying to so a follow along project. Basically trying out CRUD API.
My routes.rb
Rails.application.routes.draw do
# For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
get '/', to: 'status#index'
jsonapi_resource :authors
end
ApplicationController.rb
class ApplicationController < ActionController::API
include JSONAPI::ActsAsResourceController
end
AuthorResource
class AuthorResource < JSONAPI::Resource
attributes :first, :last
end
Schema.rb
ActiveRecord::Schema.define(version: 2023_02_02_083747) do
create_table "authors", force: :cascade do |t|
t.string "first"
t.string "last"
t.datetime "created_at", precision: 6, null: false
t.datetime "updated_at", precision: 6, null: false
end
end
When I try to add authors via POST call, data is getting added to DB. But GET call returns a error response
POST CALL REQ/RES
{
"data":{
"type":"authors",
"attributes":{
"first":"Yuval",
"last":"Harari"
}
}
}
{
"data": {
"id": "4",
"type": "authors",
"links": {
"self": "http://localhost:3000/authors/4"
},
"attributes": {
"first": "Yuval",
"last": "Harari"
}
}
}
Response for GET call
{
"errors": [
{
"title": "Record not found",
"detail": "The record identified by could not be found.",
"code": "404",
"status": "404"
}
]
}
ERROR IN CONSOLE
ActionController::RoutingError (No route matches [GET] "/authors/4"):
Can anybody help me understand the problem please ? I am using rails v 6.1.7