ruby on rails - some of my images, my javascript and my bootstrap css won't work on heroku -

i have found bunch of solutions , tried implement them, none of them solved issue. java script code in : assets/javascripts/application.js css bootstrap in : assets/stylesheets/custom.css.scss , images in: assets/images of them png.

i've included rails_12factor gem in gem file

source 'https://rubygems.org'  # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.0.0'  # use sqlite3 database active record  # use scss stylesheets gem 'sass-rails', '~> 4.0.0'  # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0'  # use coffeescript .js.coffee assets , views gem 'coffee-rails', '~> 4.0.0'  # see https://github.com/sstephenson/execjs#readme more supported runtimes # gem 'therubyracer', platforms: :ruby  # use jquery javascript library gem 'jquery-rails'  # turbolinks makes following links in web application faster. read more: https://github.com/rails/turbolinks gem 'turbolinks'  # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 1.2'  # gem encryption gem 'bcrypt-ruby', '3.0.1'  # gem bootstrap gem 'bootstrap-sass', '2.3.2'  group :doc   # bundle exec rake doc:rails generates api under doc/api.   gem 'sdoc', require: false end  group :development, :test     gem 'sqlite3' end  group :production     gem 'pg'     gem 'rails_12factor' end 

i've updated environments/production.rb file

project::application.configure   # settings specified here take precedence on in config/application.rb.    # code not reloaded between requests.   config.cache_classes = true    # eager load code on boot. eager loads of rails ,   # application in memory, allowing both thread web servers   # , relying on copy on write perform better.   # rake tasks automatically ignore option performance.   config.eager_load = true    # full error reports disabled , caching turned on.   config.consider_all_requests_local       = false   config.action_controller.perform_caching = true    # enable rack::cache put simple http cache in front of application   # add `rack-cache` gemfile before enabling this.   # large-scale production use, consider using caching reverse proxy nginx, varnish or squid.   # config.action_dispatch.rack_cache = true    # disable rails's static asset server (apache or nginx this).   config.serve_static_assets = true    # compress javascripts , css.   config.assets.js_compressor = :uglifier   # config.assets.css_compressor = :sass    # not fallback assets pipeline if precompiled asset missed.   config.assets.compile = false    # generate digests assets urls.   config.assets.digest = true    # version of assets, change if want expire assets.   config.assets.version = '1.0'    # specifies header server uses sending files.   # config.action_dispatch.x_sendfile_header = "x-sendfile" # apache   # config.action_dispatch.x_sendfile_header = 'x-accel-redirect' # nginx    # force access app on ssl, use strict-transport-security, , use secure cookies.   # config.force_ssl = true    # set :debug see in log.   config.log_level = :info    # prepend log lines following tags.   # config.log_tags = [ :subdomain, :uuid ]    # use different logger distributed setups.   # config.logger = activesupport::taggedlogging.new(sysloglogger.new)    # use different cache store in production.   # config.cache_store = :mem_cache_store    # enable serving of images, stylesheets, , javascripts asset server.   # config.action_controller.asset_host = "http://assets.example.com"    # precompile additional assets.   # application.js, application.css, , non-js/css in app/assets folder added.   # config.assets.precompile += %w( search.js )    # ignore bad email addresses , not raise email delivery errors.   # set true , configure email server immediate delivery raise delivery errors.   # config.action_mailer.raise_delivery_errors = false    # enable locale fallbacks i18n (makes lookups locale fall   # i18n.default_locale when translation can not found).   config.i18n.fallbacks = true    # send deprecation notices registered listeners.   config.active_support.deprecation = :notify    # disable automatic flushing of log improve performance.   # config.autoflush_log = false    # use default logging formatter pid , timestamp not suppressed.   config.log_formatter = ::logger::formatter.new end 

i tried add

config.assets.initialize_on_precompile = false 

to application.rb

per request adding application.js

$(document).on('page:load', function() {     $( ".draggable" ).draggable();   });  $(document).ready(function(){   $(".draggable").draggable(); }); 

am missing anything?

images issue solved replacing html code <img src= ""> <%= image_tag("") %>

bootstrap icons- had download them directly http://glyphicons.com/, , change html <%= content_tag(:i, "", class: "icon-user") %>

javascript issue resolved afterward