Modify the configuration of ckeditor 4

add links, headers and images

config/initializers/ckeditor.rb

@@ -1,4 +1,58 @@
+# Use this hook to configure ckeditor
 Ckeditor.setup do |config|
-  config.assets_languages = Rails.application.config.i18n.available_locales.map{|l| l.to_s.downcase}
-  config.assets_plugins = %w[copyformatting tableselection scayt wsc]
+  # ==> ORM configuration
+  # Load and configure the ORM. Supports :active_record (default), :mongo_mapper and
+  # :mongoid (bson_ext recommended) by default. Other ORMs may be
+  # available as additional gems.
+  require 'ckeditor/orm/active_record'
+
+  # Allowed image file types for upload.
+  # Set to nil or [] (empty array) for all file types
+  # By default: %w(jpg jpeg png gif tiff)
+  # config.image_file_types = %w(jpg jpeg png gif tiff)
+
+  # Allowed flash file types for upload.
+  # Set to nil or [] (empty array) for all file types
+  # By default: %w(jpg jpeg png gif tiff)
+  # config.flash_file_types = %w(swf)
+
+  # Allowed attachment file types for upload.
+  # Set to nil or [] (empty array) for all file types
+  # By default: %w(doc docx xls odt ods pdf rar zip tar tar.gz swf)
+  # config.attachment_file_types = %w(doc docx xls odt ods pdf rar zip tar tar.gz swf)
+
+  # Setup authorization to be run as a before filter
+  # By default: there is no authorization.
+  # config.authorize_with :cancan
+
+  # Override parent controller CKEditor inherits from
+  # By default: 'ApplicationController'
+  # config.parent_controller = 'MyController'
+
+  # Asset model classes
+  # config.picture_model { Ckeditor::Picture }
+  # config.attachment_file_model { Ckeditor::AttachmentFile }
+
+  # Paginate assets
+  # By default: 24
+  # config.default_per_page = 24
+
+  # Customize ckeditor assets path
+  # By default: nil
+  # config.asset_path = 'http://www.example.com/assets/ckeditor/'
+
+  # To reduce the asset precompilation time, you can limit plugins and/or languages to those you need:
+  # By default: nil (no limit)
+  # config.assets_languages = ['en', 'uk']
+  # config.assets_plugins = ['image', 'smiley']
+
+  # CKEditor CDN
+  # More info here http://cdn.ckeditor.com/
+  # By default: nil (CDN disabled)
+  # config.cdn_url = '//cdn.ckeditor.com/4.7.1/standard/ckeditor.js'
+
+  # JS config url
+  # Used when CKEditor CDN enabled
+  # By default: "ckeditor/config.js"
+  # config.js_config_url = 'ckeditor/config.js'
 end