Add PGHero

Author: khasinski

Gemfile

@@ -1,5 +1,4 @@
 source 'https://rubygems.org'
-git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby '~> 3.1.4'
 
@@ -12,7 +11,7 @@ gem 'puma', '~> 5.0'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
 # Use Redis adapter to run Action Cable in production
-# gem 'redis', '~> 4.0'
+gem 'redis', '~> 4.0'
 # Use Active Model has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
 
@@ -33,19 +32,23 @@ gem "sass-rails"
 gem "uglifier"
 gem "geocoder"
 
+gem "pghero"
+
 source "https://rails-assets.org" do
   gem "rails-assets-bootswatch-sass", "< 4.0.0"
   gem "rails-assets-jquery"
 end
 
 group :development do
   gem 'listen', '~> 3.3'
-  gem "debug", ">= 1.0.0"
 end
 
 group :test do
   gem "rspec-rails", "~> 5.0.0"
   gem "factory_bot_rails", "~> 6.2.0"
+end
+
+group :development, :test do
   gem "debug", ">= 1.0.0"
 end
 

Gemfile.lock

@@ -168,6 +168,8 @@ GEM
     non-stupid-digest-assets (1.0.10)
       sprockets (>= 2.0)
     pg (1.5.4)
+    pghero (3.4.0)
+      activerecord (>= 6)
     psych (5.1.2)
       stringio
     puma (5.6.8)
@@ -216,6 +218,7 @@ GEM
       execjs
       railties (>= 3.2)
       tilt
+    redis (4.8.1)
     reline (0.4.2)
       io-console (~> 0.5)
     rspec-core (3.12.2)
@@ -284,11 +287,13 @@ DEPENDENCIES
   listen (~> 3.3)
   non-stupid-digest-assets
   pg (~> 1.1)
+  pghero
   puma (~> 5.0)
   rails (~> 6.1.7, >= 6.1.7.6)
   rails-assets-bootswatch-sass (< 4.0.0)!
   rails-assets-jquery!
   react-rails
+  redis (~> 4.0)
   rspec-rails (~> 5.0.0)
   sass-rails
   uglifier

app/controllers/home_controller.rb

@@ -3,9 +3,9 @@ def index
     list_size = 4
 
     @pets = {
-      recently_added: Pet.all.order(created_at: :desc).limit(list_size),
+      recently_added: Pet.recent.limit(list_size),
       recently_adopted: Pet.all.order(adoption_date: :desc).limit(list_size),
-      random: Pet.all.order(Arel.sql('RANDOM()')).limit(list_size),
+      random: Pet.random.limit(list_size),
       most_viewed: Pet.all.most_viewed.limit(list_size),
     }
   end

app/controllers/pets_controller.rb

@@ -32,7 +32,7 @@ def cats
   end
 
   def random
-    @pet = Pet.order("random()").first
+    @pet = Pet.random.first
     redirect_to pet_path(@pet)
   end
 

app/models/pet.rb

@@ -17,6 +17,7 @@ class Pet < ApplicationRecord
 
   scope :recent, -> { order("created_at DESC") }
   scope :available, -> { where(adoption_date: nil) }
+  scope :random, -> { order("RANDOM()") }
   scope :search, ->(search) { where("name ILIKE :search OR breed ILIKE :search", { search: "%#{search}%" }) }
 
   scope :dogs, -> { where(pet_type: "dog") }

config/application.rb

@@ -25,7 +25,6 @@ class Application < Rails::Application
       controller_specs: false
     )
 
-
     def database_is_not_empty(override = false)
       return false if override
       @database_is_not_empty ||= (Pet.count != 0)

config/database.yml

@@ -17,6 +17,9 @@
 default: &default
   adapter: postgresql
   encoding: unicode
+  host: db
+  username: postgres
+  password: postgres
   # For details on connection pooling, see Rails configuration guide
   # https://guides.rubyonrails.org/configuring.html#database-pooling
   pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
@@ -36,5 +39,3 @@ production:
   <<: *default
   host: db
   database: adopter_production
-  username: postgres
-  password: postgres

config/routes.rb

@@ -16,17 +16,21 @@
     resources :pets, only: [:index]
   end
 
+
+
+  # workshop helper routes
+
+  post '/workshop/generate_data', to: -> (env) do
+    GenerateDataJob.perform_later(
+      (env['rack.request.form_hash']['data_generation_loop_size'] || 100).to_i
+    )
+    [303, { 'Location' => '/' }, ['Redirecting...']]
+  end
+
   namespace :mock do
     get '/slow-service', to: '/mock#slow_service'
     get '/outlier/:id', to: '/mock#outlier'
   end
 
-  # workshop helper routes
-
-    post '/workshop/generate_data', to: -> (env) do
-      GenerateDataJob.perform_later(
-        (env['rack.request.form_hash']['data_generation_loop_size'] || 100).to_i
-      )
-      [303, { 'Location' => '/' }, ['Redirecting...']]
-    end
+  mount PgHero::Engine, at: "pghero"
 end

db/migrate/20240130202306_enable_pg_stat.rb

@@ -0,0 +1,5 @@
+class EnablePgStat < ActiveRecord::Migration[6.1]
+  def change
+    enable_extension 'pg_stat_statements'
+  end
+end

db/schema.rb

@@ -7,6 +7,7 @@ services:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres
       POSTGRES_DB: adopter_production
+    command: postgres -c shared_preload_libraries=pg_stat_statements -c pg_stat_statements.track=all
     ports:
       - 5432:5432