Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED) が解決できない

前提・実現したいこと

railsとredisを連携してPVランキングを表示させたい。

railsとredisをでブログサイトを作っています。PVランキングをredisのソート済みセットを使って表示したいのですが、redisがうまく繋がってないのかエラーが表示され進みません。どこがどう原因なのかアドバイスいただけたらと思います。

発生している問題・エラーメッセージ

Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED)

該当のソースコード

posts_controller.rb

def index
    @posts = Post.all
    ids = REDIS.zrevrange "posts/dayly/#{Date.today.to_s}", 0, 19#ここ
    @posts = Post.where(id: ids)
end
def show
    REDIS.zincrby "posts/daily/#{Date.today.to_s}", 1, "#{@post.id}"
end

docker-compose.yml

version: '3'
services:
  db:
    image: mysql:8.0.17
    command: mysqld --default-authentication-plugin=mysql_native_password
    volumes:
      - ./db/mysql_data:/var/lib/mysql 
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: root
    ports:
      - "4306:3306"

  web:
    build: .
    command: bundle exec rails s -p 3000 -b '0.0.0.0'
    volumes:
      - .:/app_name
    ports:
      - "3000:3000"
    depends_on:
      - db
      - redis
    tty: true
    stdin_open: true
    links:
      - db
    environment:
      REDIS_HOST: localhost
      REDIS_PORT: 6379

  redis:
    image: redis
    ports:
      - 6379:6379
    volumes:
      - ./redis:/data
    command: redis-server --appendonly yes

redis.rb

require 'redis'
    
uri = URI.parse('localhost:6379')
REDIS = Redis.new(host: uri.host, port: uri.port)

$ docker ps
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                               NAMES
5db5ff1808ee        blog_practice_9_web   "bundle exec rails s…"   20 minutes ago      Up 19 minutes       0.0.0.0:3000->3000/tcp              blog_practice_9_web_1
8458707944eb        redis                 "docker-entrypoint.s…"   20 minutes ago      Up 20 minutes       0.0.0.0:6379->6379/tcp              blog_practice_9_redis_1
b5a66b7a6848        mysql:8.0.17          "docker-entrypoint.s…"   20 minutes ago      Up 20 minutes       33060/tcp, 0.0.0.0:4306->3306/tcp   blog_practice_9_db_1

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.6.3'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.2'
# Use mysql as the database for Active Record
gem 'mysql2', '>= 0.4.4', '< 0.6.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  gem 'chromedriver-helper'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

#devise gem
gem 'devise'

#blog
gem 'execjs'
gem 'therubyracer'

#redis
gem 'redis', '4.1.3'