By using Redis, I tried creating ranking system on Ruby on rails.
My environments: windows10, vagrant, Ruby -v 2.2.3, rails -v 4.2.5, mysql2 -v 0.3.18...
However I got the following error.
Error connecting to Redis on 127.0.0.1:6379 (ECONNREFUSED)
this is error pic on rails application...
I guess that something is wrong with not code in app/posts_controller.rb but my other setting files.
That's why when I run zadd hoge 1 1 and zrange hoge 0 -1 etc on tarminal by using redis-cli after ruing redis-server, I got outsputs without any problem.
The following files which is related to my rails application:
gemfile.lock
First I run bundle install gem 'redis' and gem 'redis-rails'.
GEM remote: https://rubygems.org/ specs: actionmailer (4.2.5) actionpack (= 4.2.5) actionview (= 4.2.5) activejob (= 4.2.5) mail (~> 2.5, >= 2.5.4) rails-dom-testing (~> 1.0, >= 1.0.5) actionpack (4.2.5) actionview (= 4.2.5) activesupport (= 4.2.5) rack (~> 1.6) rack-test (~> 0.6.2) rails-dom-testing (~> 1.0, >= 1.0.5) rails-html-sanitizer (~> 1.0, >= 1.0.2) actionview (4.2.5) activesupport (= 4.2.5) builder (~> 3.1) erubis (~> 2.7.0) rails-dom-testing (~> 1.0, >= 1.0.5) rails-html-sanitizer (~> 1.0, >= 1.0.2) activejob (4.2.5) activesupport (= 4.2.5) globalid (>= 0.3.0) activemodel (4.2.5) activesupport (= 4.2.5) builder (~> 3.1) activerecord (4.2.5) activemodel (= 4.2.5) activesupport (= 4.2.5) arel (~> 6.0) activesupport (4.2.5) i18n (~> 0.7) json (~> 1.7, >= 1.7.7) minitest (~> 5.1) thread_safe (~> 0.3, >= 0.3.4) tzinfo (~> 1.1) arel (6.0.4) bcrypt (3.1.12) binding_of_caller (0.8.0) debug_inspector (>= 0.0.1) builder (3.2.3) byebug (10.0.2) coderay (1.1.2) coffee-rails (4.1.1) coffee-script (>= 2.2.0) railties (>= 4.0.0, < 5.1.x) coffee-script (2.4.1) coffee-script-source execjs coffee-script-source (1.12.2) concurrent-ruby (1.0.5) crass (1.0.4) debug_inspector (0.0.3) devise (4.5.0) bcrypt (~> 3.0) orm_adapter (~> 0.1) railties (>= 4.1.0, < 6.0) responders warden (~> 1.2.3) erubis (2.7.0) execjs (2.7.0) globalid (0.4.1) activesupport (>= 4.2.0) hike (1.2.3) i18n (0.9.5) concurrent-ruby (~> 1.0) jbuilder (2.7.0) activesupport (>= 4.2.0) multi_json (>= 1.2) jquery-rails (4.3.3) rails-dom-testing (>= 1, < 3) railties (>= 4.2.0) thor (>= 0.14, < 2.0) json (1.8.6) loofah (2.2.2) crass (~> 1.0.2) nokogiri (>= 1.5.9) mail (2.7.0) mini_mime (>= 0.1.1) method_source (0.9.0) mini_mime (1.0.1) mini_portile2 (2.3.0) minitest (5.11.3) multi_json (1.13.1) mysql2 (0.3.18) nokogiri (1.8.4) mini_portile2 (~> 2.3.0) orm_adapter (0.5.0) pry (0.11.3) coderay (~> 1.1.0) method_source (~> 0.9.0) pry-rails (0.3.6) pry (>= 0.10.4) rack (1.6.10) rack-test (0.6.3) rack (>= 1.0) rails (4.2.5) actionmailer (= 4.2.5) actionpack (= 4.2.5) actionview (= 4.2.5) activejob (= 4.2.5) activemodel (= 4.2.5) activerecord (= 4.2.5) activesupport (= 4.2.5) bundler (>= 1.3.0, < 2.0) railties (= 4.2.5) sprockets-rails rails-deprecated_sanitizer (1.0.3) activesupport (>= 4.2.0.alpha) rails-dom-testing (1.0.9) activesupport (>= 4.2.0, < 5.0) nokogiri (~> 1.6) rails-deprecated_sanitizer (>= 1.0.1) rails-html-sanitizer (1.0.4) loofah (~> 2.2, >= 2.2.2) railties (4.2.5) actionpack (= 4.2.5) activesupport (= 4.2.5) rake (>= 0.8.7) thor (>= 0.18.1, < 2.0) rake (12.3.1) rdoc (4.3.0) redis (3.2.0) redis-actionpack (5.0.2) actionpack (>= 4.0, < 6) redis-rack (>= 1, < 3) redis-store (>= 1.1.0, < 2) redis-activesupport (5.0.7) activesupport (>= 3, < 6) redis-store (>= 1.3, < 2) redis-rack (2.0.4) rack (>= 1.5, < 3) redis-store (>= 1.2, < 2) redis-rails (5.0.2) redis-actionpack (>= 5.0, < 6) redis-activesupport (>= 5.0, < 6) redis-store (>= 1.2, < 2) redis-store (1.5.0) redis (>= 2.2, < 5) responders (2.4.0) actionpack (>= 4.2.0, < 5.3) railties (>= 4.2.0, < 5.3) sass (3.2.19) sass-rails (4.0.5) railties (>= 4.0.0, < 5.0) sass (~> 3.2.2) sprockets (~> 2.8, < 3.0) sprockets-rails (~> 2.0) sdoc (0.4.2) json (~> 1.7, >= 1.7.7) rdoc (~> 4.0) spring (2.0.2) activesupport (>= 4.2) sprockets (2.11.0) hike (~> 1.2) multi_json (~> 1.0) rack (~> 1.0) tilt (~> 1.1, != 1.3.0) sprockets-rails (2.3.3) actionpack (>= 3.0) activesupport (>= 3.0) sprockets (>= 2.8, < 4.0) thor (0.20.0) thread_safe (0.3.6) tilt (1.4.1) turbolinks (5.2.0) turbolinks-source (~> 5.2) turbolinks-source (5.2.0) tzinfo (1.2.5) thread_safe (~> 0.1) uglifier (4.1.19) execjs (>= 0.3.0, < 3) warden (1.2.7) rack (>= 1.0) web-console (2.3.0) activemodel (>= 4.0) binding_of_caller (>= 0.7.2) railties (>= 4.0) sprockets-rails (>= 2.0, < 4.0)PLATFORMS rubyDEPENDENCIES byebug coffee-rails (~> 4.1.0) devise jbuilder (~> 2.0) jquery-rails mysql2 (= 0.3.18) pry-rails rails (= 4.2.5) redis (= 3.2.0) redis-rails sass-rails (~> 4.0.2) sdoc (~> 0.4.0) spring sprockets (= 2.11.0) turbolinks uglifier (>= 1.3.0) web-console (~> 2.0)BUNDLED WITH 1.10.6config/initializes/redis.rb
Second, I created this file.
require 'redis'uri = URI.parse(ENV["REDIS"])REDIS = Redis.new(host: uri.host, port: uri.port)config/environments/development.rb
Third, I added ENV["REDIS"] = "localhost:6379" in the lowest line.
Rails.application.configure do # Settings specified here will take precedence over those in config/application.rb. # In the development environment your application's code is reloaded on # every request. This slows down response time but is perfect for development # since you don't have to restart the web server when you make code changes. config.cache_classes = false # Do not eager load code on boot. config.eager_load = false # Show full error reports and disable caching. config.consider_all_requests_local = true config.action_controller.perform_caching = false # Don't care if the mailer can't send. config.action_mailer.raise_delivery_errors = false # Print deprecation notices to the Rails logger. config.active_support.deprecation = :log # Raise an error on page load if there are pending migrations. config.active_record.migration_error = :page_load # Debug mode disables concatenation and preprocessing of assets. # This option may cause significant delays in view rendering with a large # number of complex assets. config.assets.debug = true # Asset digests allow you to set far-future HTTP expiration dates on all assets, # yet still be able to expire them through the digest params. config.assets.digest = true # Adds additional error checking when serving assets at runtime. # Checks for improperly declared sprockets dependencies. # Raises helpful error messages. config.assets.raise_runtime_errors = true # Raises error for missing translations # config.action_view.raise_on_missing_translations = true ENV["REDIS"] = "localhost:6379"endapp/controller/posts_controller.rb
Finally, I described new code in def index and def show.
ids = REDIS.zrevrange "ranking", 0, -1@ranking_posts = Post.where(id: ids)
REDIS.zincrby "ranking", 1, "#{@post.id}"
By the way if I didn't describe two descriptions above,of course my rails application worked.
class PostsController < ApplicationController def index @posts = Post.all.order(id: :desc) ids = REDIS.zrevrange "ranking", 0, -1 #the order of posts ranking @ranking_posts = Post.where(id: ids) end def show @post = Post.find_by(id: params[:id]) # update ranking REDIS.zincrby "ranking", 1, "#{@post.id}" end def new end def create Post.create(name: post_params[:name], text: post_params[:text], user_id: current_user.id) redirect_to("/") end def destroy post = Post.find(params[:id]) if post.user_id == current_user.id post.destroy end redirect_to("/")Please tell me how can I fix this error...（；^；）