Require a library with fallback to RubyGems. Warnings during library loading are silenced to increase signal/noise for application warnings.
# File activesupport/lib/active_support/core_ext/kernel/requires.rb, line 6 def require_library_or_gem(library_name) silence_warnings do begin require library_name rescue LoadError => cannot_require # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try. begin require 'rubygems' rescue LoadError # => rubygems_not_installed raise cannot_require end # 2. Rubygems is installed and loaded. Try to load the library again begin require library_name rescue LoadError # => gem_not_installed raise cannot_require end end end end