Javascript资产未加载到已部署的Heroku应用（生产）中，但在本地运行良好

Question

I have been fighting with this issue for the past two days now and have gotten nowhere, unfortunately. I know this is a regularly asked question but none of the answers I have encountered have helped.

Below shows my assets in Chrome when the application is run locally.

Assets in Chrome(local)

Below are assets in Chrome Production

Assets in Chrome(production)

What I have tried

I have tried doing config.assets.compile = true

I tried reorganizing my application.js file

also RAILS_ENV=production bin/rails assets:precompile and then deployed to production.

I honestly wish I could remember all the steps i have tried but the ones above are the most reoccurring.

Code

gemfile

source 'https://rubygems.org'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.6'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.18'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
gem 'jquery-ui-rails'
# 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', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

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


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

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '~> 3.0.5'
  # 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

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

group :development, :test do
  gem 'rspec-rails', '~> 3.5'
  gem "factory_bot_rails"
  gem 'database_cleaner'
end


group :production do
  gem 'mini_racer'
end

gem 'devise'
gem 'bootstrap', '4.0.0.alpha6'

gem "awesome_print", require:"ap"
gem 'simple_form'
gem 'jquery-ui-rails'
gem 'gon'
gem 'sprockets', '~>3.7.2'
gem 'rails-assets-tether', '>= 1.1.0'

application.js

//
//= require jquery
//= require "tether"
//= require jquery-ui
//= require bootstrap
//= require_tree .
//= require bootstrap-sprockets

application.rb

require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module Chessapp
  class Application < Rails::Application
    config.serve_static_assets = true
    config.assets.compile = true
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.
  end
end

production.rb

Rails.application.configure do
  #config.action_mailer.default_url_options = { host: 'chesschessrevolution.herokuapp.com' }

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both threaded web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true

  # Full error reports are disabled and caching is turned on.
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  config.serve_static_assets = true
  # Disable serving static files from the `/public` folder by default since
  # Apache or NGINX already handles this.
  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?

  # Compress JavaScripts and CSS.
  config.assets.js_compressor = Uglifier.new(harmony: true)
  # config.assets.css_compressor = :sass

  # Do not fallback to assets pipeline if a precompiled asset is missed.
  config.assets.compile = true

  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb

  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
  # config.action_controller.asset_host = 'http://assets.example.com'

  # Specifies the header that your server uses for sending files.
  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX

  # Mount Action Cable outside main process or domain
  # config.action_cable.mount_path = nil
  # config.action_cable.url = 'wss://example.com/cable'
  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http:\/\/example.*/ ]

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  # config.force_ssl = true

  # Use the lowest log level to ensure availability of diagnostic information
  # when problems arise.
  config.log_level = :debug

  # Prepend all log lines with the following tags.
  config.log_tags = [ :request_id ]

  # Use a different cache store in production.
  # config.cache_store = :mem_cache_store

  # Use a real queuing backend for Active Job (and separate queues per environment)
  # config.active_job.queue_adapter     = :resque
  # config.active_job.queue_name_prefix = "chessapp_#{Rails.env}"
  config.action_mailer.perform_caching = false

  # Ignore bad email addresses and do not raise email delivery errors.
  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
  # config.action_mailer.raise_delivery_errors = false

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation cannot be found).
  config.i18n.fallbacks = true

  # Send deprecation notices to registered listeners.
  config.active_support.deprecation = :notify

  # Use default logging formatter so that PID and timestamp are not suppressed.
  config.log_formatter = ::Logger::Formatter.new

  # Use a different logger for distributed setups.
  # require 'syslog/logger'
  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')

  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?

  if ENV["RAILS_LOG_TO_STDOUT"].present?
    logger           = ActiveSupport::Logger.new(STDOUT)
    logger.formatter = config.log_formatter
    config.logger = ActiveSupport::TaggedLogging.new(logger)
  end

  # Do not dump schema after migrations.
  config.active_record.dump_schema_after_migration = false
end

application.html.erb

<!DOCTYPE html>
<html>
  <head>
    <title>Chessapp</title>
    <%= csrf_meta_tags %>
    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': true %>
    <link href="https://fonts.googleapis.com/css?family=Audiowide" rel="stylesheet">
  </head>
  <body>
    <%= render 'shared/nav' %>
    <div>
        <% flash.each do |key, value| %>
    <div class="alert alert-<%= key %>"><%= value %></div>
  <% end %>
        <class="notice"><%= notice %></p>
        <class="alert"><%= alert %></p>

        <%= yield %>

    </div>
  </body>
</html>

Any help on this would be greatly appreciated. If the information I provided isn't sufficient please feel free to check out the repository @ github .

Answer 1

Assets are loading, the reason why you are not able to see them individually(separate files) in production is because rails precompiles(minimizes) all the assets and puts into a single file.

So if you have look at your application.css and application.js which is getting rendered in production you can see that it contains bootstrap, jquery, jquery-ui etc which you've required in application.js

I had a look at your application.css and application.js and it contained all the assets you've required. They are not available anymore probably because you have done re-deployment.

You can learn more about asset pipeline here