select2-rails gem is not working on Rails4

Question

I have tried given documentation for the select2-rails gem, but my browser console still throws an error.

Uncaught TypeError: $(...).select2 is not a

Answer 1

I never encountered this issue while using rails 4.1.5 & select2-rails 3.5.9.3. However, after upgrading rails to 4.2.4, I get the same exact error described in this question:

Uncaught TypeError: $(...).select2 is not a function

I was able to resolve the error by removing the "select2-rails" gem from my Gemfile and replacing it with:

source 'https://rails-assets.org' do
  gem 'rails-assets-select2', '~> 4.0.0'
end