undefined method `alias_method_chain' for ActionController::Base:Class

[arshekas]

Hi,

We have updated our rails app from rails 4.2.6 to rails 5.2.5 and ruby version from 2.3.0 to 2.6.6, we have changed the code according to here https://gist.github.com/anklos/eb0088e26223c92a034cd1ea36fcee2c. However, when we run the application we are getting this error somewhere from application.rb

code from application.rb where erroring out

require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups). **THIS LINE GIVING ERROR**

Error

`block in <module:ControllerHelper>': undefined method `alias_method_chain' for ActionController::Base:Class (NoMethodError)
Did you mean?  alias_method

Any help would be appreciated!

Thanks

[nvasilevski]

Is there a stacktrace available for the exception? As Eileen pointed out in a different issue, it is unlikely caused by Rails and most likely called from one of the gems. Similar to #46660 (comment)

You can look through the source for Rails 5.2.5 https://github.dev/rails/rails/tree/cb0a558f42fc6957fac4d2daa16771b72ff7da6e and see that nothing in Rails 5.2.5 is calling alias_method_chain

Based on a very similar issue, usually stacktrace should point to the code that is still using removed alias_method_chain method

[eileencodes]

Closing because this isn't a bug in Rails, 5.2 removed all calls to alias_method_chain so it's the app or another gem.