Question

Short Version: How to determine which file or gem is requiring a certain file

A bit longer ..

I have a Rails 3.0.3 / mongoid application, so I am not using ActiveRecord. The top of my application.rb file looks like so:

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

#require 'rails/all'
require "action_controller/railtie"
require "action_mailer/railtie"

But after rails loads, if I go into the console and type:

defined?(ActiveRecord::Base)
#=> "constant"

I expected it to be nil.

So one of my gems must be loading ActiveRecord.

How do I determine which gem or file is requiring ActiveRecord?

Answer 1

Ok, I figured out a way to do it, but not sure its the best:

Since I am using bundler, I simply added a break point after bundler requires the file, and then check afterwards if the file was loaded.

I added the breakpoint in Bundler::Runtime#require at the Kernel.require line.

Chime in if there is a more elegant way.