Disable asset pipeline in Rails 4

gistfile1.txt

Comment in Gemfile:

# Use SCSS for stylesheets
# gem 'sass-rails', '~> 4.0.0'

# Use Uglifier as compressor for JavaScript assets
# gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
# gem 'coffee-rails', '~> 4.0.0'

config/application.rb:

# split out components and comment sprockets
# require 'rails/all'
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
# require "sprockets/railtie"
require "rails/test_unit/railtie"

class Application < Rails::Application
    # turn pipeline off
    config.assets.enabled = false
end

Thanks @simonrobson! This helped me to remove assets pipeline from a Rails 5.2 project making a few addional changes:

After commenting require sprockets/railtie from application.rb file we has no more access to assets pipeline configuration so we will need to remove assets.rb file, and all references to Rails.application.config.assets from your application, environment and initializers files.