Assets pipeline doesn't work in 'application.scss' in my Rails 4.2 app

Question

I\'m new in Rails and apologize if that is a stupid question. But i cannot resolve my problem: I added Bootstrap to my new app but it still doesn\'t use any new styles.

Answer 1

I suspect you have an older version of bootstrap in your environment. Try updating your Gemfile with gem 'bootstrap-sass', '3.3.3' and running bundle. Make sure to restart your server after the update.

Alternatively, you can just run bundle update.

Answer 2

After several hours i've found a problem - my pages_controller was incorrect:

class PagesController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
end

instead of:

class PagesController < ApplicationController
  def index_page
  end
end

Controllers should inherit from main Controller!

P.S: Adding string layout "application" to the wrong controller also helped:

class PagesController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  layout "application"
end

But I do not recommend go that way

Answer 3

there is an easier way, I will describe the sequence: after adding gem 'bootstrap-sass' doing bundle install, restart server than add in config/application.rb next string:

config.assets.precompile += %w(*.png *.jpg *.jpeg *.gif)

for your images, than create custom.css.scss in app/assets/stylesheets and add there @import "bootstrap";, in your custom.css.scss you can write your own styles