API GET /purr endpoint

app/controllers/api_controller.rb

@@ -1,2 +1,8 @@
 class ApiController < ApplicationController
+  include Response
+
+  def random_image
+    image = Image.order(Arel.sql('RAND()')).first
+    json_response image, 200
+  end
 end

app/controllers/concerns/response.rb

@@ -0,0 +1,5 @@
+module Response
+  def json_response(object, status = :ok)
+    render json: object, status: status
+  end
+end

app/models/Image.rb

@@ -0,0 +1,2 @@
+class Image < ApplicationRecord
+end

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
+  get 'purr', to: 'api#random_image'
 end