アプリを Rails 3.2 から Rails 4 にアップグレードした後、次のエラーが発生しました。
/xxx/activesupport-4.0.0/lib/active_support/core_ext/module/aliasing.rb:32:
in `alias_method': undefined method `join_asset_file_contents' for
module `ActionView::Helpers::AssetTagHelper' (NameError)
from /xxx/activesupport-4.0.0/lib/active_support/core_ext/module/aliasing.rb:32:
in `alias_method_chain'
どうすればこれを解決できますか?
私のGemfile
source 'http://rubygems.org'
gem 'rails', '4.0.0'
gem 'geocoder'
gem 'dalli'
gem "rmagick",:platforms=>:ruby
gem "rscribd"
gem "rubyzip", "0.9.9", :require => 'zip/zip'
gem "roo", "1.12.2"
gem "nokogiri", "1.6.0"
gem "spreadsheet"
gem "google-spreadsheet-ruby"
gem "mysql2", "0.3.13" ,:platforms=>:ruby
gem "delocalize"
gem 'rake', '10.1.0'
gem 'smurf'
gem 'json'
gem 'httparty'
gem 'remotipart', '1.2.1'
gem "delayed_job"
gem "nested_form","0.3.2"