feat: ✨ Links controller

Show method, Home page, redirection validation

LinksController show method

app/controllers/links_controller.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class LinksController < ApplicationController
+  def home
+    render 'links/home'
+  end
+
+  def show
+    @link = Link.find_by_slug(link_params[:slug])
+    
+    if @link.nil?
+      render file: "#{Rails.root}/public/404", status: :not_found
+    else
+      @link.update(click_counter: @link.click_counter + 1)
+      redirect_to @link.url
+    end
+  end
+
+  def link_params
+    params.permit(:slug)
+  end
+end

app/helpers/links_helper.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+module LinksHelper
+end

app/models/link.rb

@@ -5,7 +5,6 @@ class Link < ApplicationRecord
   validates_uniqueness_of :slug
 
   validates :url, format: { with: URI::DEFAULT_PARSER.make_regexp, message: 'invalid format' }
-
   validates_length_of :url, within: 3..30_000, on: :create, message: 'max length is 30000'
 
   before_validation :generate_slug

app/views/links/home.html.erb

@@ -0,0 +1,3 @@
+<%= content_tag :div, nil, data: {controller: "hello"} do %>
+  <div class="btn btn-primary">Say Hello</div>
+<% end %>

config/routes.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
 Rails.application.routes.draw do
+  root 'links#home'
+
   get '/:slug', to: 'links#show', as: :short
 end

db/schema.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -12,16 +10,18 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20_210_613_145_459) do
-  # These are extensions that must be enabled in order to support this database
-  enable_extension 'plpgsql'
+ActiveRecord::Schema.define(version: 2021_06_13_145459) do
 
-  create_table 'links', force: :cascade do |t|
-    t.string 'slug', null: false
-    t.text 'url'
-    t.integer 'click_counter', default: 0
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.index ['slug'], name: 'index_links_on_slug'
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "plpgsql"
+
+  create_table "links", force: :cascade do |t|
+    t.string "slug", null: false
+    t.text "url"
+    t.integer "click_counter", default: 0
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["slug"], name: "index_links_on_slug"
   end
+
 end

test/controllers/links_controller_test.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class LinksControllerTest < ActionDispatch::IntegrationTest
+  test 'Should get Home page' do
+    get '/'
+    assert_response :success, 'Not rendered home page'
+  end
+
+  test 'Should return 404 for unavailable slug' do
+    get '/test'
+    assert_response :not_found, 'Not rendered not found'
+  end
+
+  test 'Should redirect from slug to url' do
+    link = links(:one)
+    slug = link.slug
+    get short_url(slug: slug)
+
+    assert_redirected_to link.url, 'Not redirected to link url'
+  end
+end