Has Heroku caused your CSS Stylesheet to fail to load after deployment?

I've been struggling with understanding the asset pipeline in Rails 4 for some time now. I managed to figure out how to pre-compile assets, but after deploying my application, the CSS stylesheet doesn't seem to be updating.

To confirm this, I checked Developer Tools and noticed that the source code looked different from my CSS files. My suspicion is that the issue lies within my production.rb file.

Production.rb

Games::Application.configure do

  config.cache_classes = true
  config.eager_load = true
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  config.serve_static_assets = true
  config.assets.js_compressor = :uglifier
  config.assets.compile = true
  config.assets.digest = true
  config.assets.version = '1.0'
  config.log_level = :info
  config.i18n.fallbacks = true
  config.active_support.deprecation = :notify
  config.log_formatter = ::Logger::Formatter.new
end

Application.rb

require File.expand_path('../boot', __FILE__)

require 'rails/all'

Bundler.require(*Rails.groups)

module Games
  class Application < Rails::Application
    config.assets.precompile += %w(*.png *.jpg *.jpeg *.gif)
    config.exceptions_app = self.routes
  end
end

Below is my Application.html.erb file containing the helpers.

<!DOCTYPE html>
  <html>

    <head>
      <title><%= @title %></title>
      <%= stylesheet_link_tag    "application", media: "all",
      "data-turbolinks-track" => true %>
      <%= javascript_include_tag "application", "data-turbolinks-track" => true %>
      <%= csrf_meta_tags %>
    </head>

    <body>

      <%= yield %>

      <%= render 'layouts/footer' %>

    </body>

  </html>

Gem File

gem 'rails', '4.0.4'

group :development, :test do
  gem 'sqlite3', '1.3.8'
  gem 'rspec-rails', '2.13.1'
end

group :production do
  gem 'pg', '0.17.1'
  gem 'rails_12factor'
end

group :test do
  gem 'selenium-webdriver', '2.35.1'
  gem 'capybara', '2.1.0'
end

gem 'sass-rails', '~> 4.0.2'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'sprockets-rails', '~> 2.0.0'
gem 'bootstrap-sass', '2.3.2.0'

gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.2'

Here are the steps I've taken

heroku run rake assets:precompile RAILS_ENV=production
git add .
git commit
git push heroku master

After running git add . (to add all files), I expected the latest stylesheet to be loaded as well. Unfortunately, it seems like Heroku did not update it.

This recurring issue is becoming frustrating, and I'm eager to find a solution for it.

Thank you for your attention.

Edit:

I believe I've identified the problem now. My stylesheets are not being updated in the public/assets folder. I'm unsure of what action to take to ensure they appear there.

Answer №1

It seems like you've included precompiled asset files in your git repository. In an ideal scenario, these files shouldn't be there as Heroku can handle this process for you automatically when you push the code.

To resolve this issue, follow these steps:

  1. git rm -r public/assets/
  2. Add public/assets/** to your .gitignore file
  3. git add .
  4. git commit -am "Allow Heroku to automatically precompile assets"
  5. git push heroku master

Answer №2

Allow me to clarify how this process can benefit you


Asset Precompilation Explained

By precompiling your assets, you will receive unique files and stylesheets due to the inclusion of an MD5 hash in their names. This is known as "asset fingerprinting," as described in reference guide:

Fingerprinting assigns a file name based on its contents, ensuring it changes when the content does. This simplifies identifying identical files, even across different servers or deployment periods.

Essentially, precompilation enables Rails to compress asset files for production, offering benefits like efficiency, reduced size, and concatenation:

Sprockets in the production environment utilizes the aforementioned fingerprinting system. By default, Rails assumes that assets are precompiled and served as static by your web server.


Handling Static Assets

In Heroku uploads and other production setups, Rails expects pre-compiled assets.

Precompilation dictates that assets reside in the public/assets directory for easy access when needed. Failure to precompile assets could potentially lead to errors.

If you're facing issues, consider:

  1. Utilizing asset path helpers when referencing assets
  2. Confirming asset calls in your layout and elsewhere
  3. Double-checking the presence of required files

Your primary action should be:

$ rake assets:precompile RAILS_ENV=production

This command compiles assets locally

Next, ensure correct asset references in your layout like so:

#app/views/layouts/application.html.erb
<%= stylesheet_link_tag "application" %>

Following these steps lets you use precompiled assets seamlessly within your Rails application. However, syntax errors may hinder the precompilation process, so addressing those is also crucial

Answer №3

Proceed with these steps:

  1. Run the command 'rake assets:precompile'
  2. Execute 'git add .'
  3. Commit changes using 'git commit -am "your commit message"'
  4. Push changes to Heroku by running 'git push heroku master'

These instructions are designed to be effective.

Answer №4

If you're working with sass, before diving into other solutions, double check that you aren't mixing .css and .scss files in your assets folder. It appears that Heroku may encounter issues when compiling assets that are a mix of these file types. While I can't provide a technical explanation for this phenomenon or confirm the accuracy of my observation, in my personal experience, I resolved this issue by simply renaming any .css files to .scss. Upon the next deployment, everything loaded correctly.

Answer №5

If you're facing issues with your css/scss files not updating on production, here's something important to keep in mind.

The reason my changes were not reflecting on the live site was because I forgot to exclude .sass-cache from .gitignore. This led to the folder being included in version control and overriding any updates made on production. Make sure to double check your gitignore settings to avoid this problem.

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